From: nicolasconnault <nicolasconnault>
Date: Fri, 13 Feb 2009 08:04:10 +0000 (+0000)
Subject: MDL-18163 Implemented stats report from LSU gradebook
X-Git-Url: http://git.mjollnir.org/gw?a=commitdiff_plain;h=1d1d29985f7c87ffd974724000f201ed60d088bc;p=moodle.git

MDL-18163 Implemented stats report from LSU gradebook
---

diff --git a/grade/report/grader/quickedit_item.php b/grade/report/grader/quickedit_item.php
new file mode 100644
index 0000000000..18f88eea82
--- /dev/null
+++ b/grade/report/grader/quickedit_item.php
@@ -0,0 +1,115 @@
+<?php // $Id$
+
+///////////////////////////////////////////////////////////////////////////
+// NOTICE OF COPYRIGHT                                                   //
+//                                                                       //
+// Moodle - Modular Object-Oriented Dynamic Learning Environment         //
+//          http://moodle.org                                            //
+//                                                                       //
+// Copyright (C) 1999 onwards  Martin Dougiamas  http://moodle.com       //
+//                                                                       //
+// This program is free software; you can redistribute it and/or modify  //
+// it under the terms of the GNU General Public License as published by  //
+// the Free Software Foundation; either version 2 of the License, or     //
+// (at your option) any later version.                                   //
+//                                                                       //
+// This program is distributed in the hope that it will be useful,       //
+// but WITHOUT ANY WARRANTY; without even the implied warranty of        //
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         //
+// GNU General Public License for more details:                          //
+//                                                                       //
+//          http://www.gnu.org/copyleft/gpl.html                         //
+//                                                                       //
+///////////////////////////////////////////////////////////////////////////
+
+
+require_once '../../../config.php';
+require_once $CFG->libdir.'/gradelib.php';
+require_once $CFG->dirroot.'/grade/lib.php';
+require_once $CFG->dirroot.'/grade/report/grader/lib.php';
+
+$courseid      = required_param('id', PARAM_INT);        // course id
+$itemid        = required_param('itemid', PARAM_INT);        // item id
+$page          = optional_param('page', 0, PARAM_INT);   // active page
+$perpageurl    = optional_param('perpage', 0, PARAM_INT);
+
+/// basic access checks
+if (!$course = $DB->get_record('course', array('id' => $courseid))) {
+    print_error('nocourseid');
+}
+
+if (!$item = $DB->get_record('grade_items', array('id' => $itemid))) {
+    print_error('noitemid', 'grades');
+}
+
+require_login($course);
+$context = get_context_instance(CONTEXT_COURSE, $course->id);
+
+require_capability('gradereport/grader:view', $context);
+require_capability('moodle/grade:viewall', $context);
+require_capability('moodle/grade:edit', $context);
+
+/// return tracking object
+$gpr = new grade_plugin_return(array('type'=>'report', 'plugin'=>'grader', 'courseid'=>$courseid, 'page'=>$page));
+
+/// last selected report session tracking
+if (!isset($USER->grade_last_report)) {
+    $USER->grade_last_report = array();
+}
+$USER->grade_last_report[$course->id] = 'grader';
+
+// Initialise the grader report object
+$report = new grade_report_grader($courseid, $gpr, $context, $page);
+
+/// processing posted grades & feedback here
+if ($data = data_submitted() and confirm_sesskey() and has_capability('moodle/grade:edit', $context)) {
+    $warnings = $report->process_data($data);
+} else {
+    $warnings = array();
+}
+
+// Override perpage if set in URL
+if ($perpageurl) {
+    $report->user_prefs['studentsperpage'] = $perpageurl;
+}
+
+// final grades MUST be loaded after the processing
+$report->load_users();
+$numusers = $report->get_numusers();
+$report->load_final_grades();
+
+/// Print header
+$a->item = $item->itemname;
+$reportname = get_string('quickedititem', 'gradereport_grader', $a);
+print_grade_page_head($COURSE->id, 'report', 'grader', $reportname);
+
+echo $report->group_selector;
+echo '<div class="clearer"></div>';
+// echo $report->get_toggles_html();
+
+//show warnings if any
+foreach($warnings as $warning) {
+    notify($warning);
+}
+
+$studentsperpage = $report->get_pref('studentsperpage');
+// Don't use paging if studentsperpage is empty or 0 at course AND site levels
+if (!empty($studentsperpage)) {
+    print_paging_bar($numusers, $report->page, $studentsperpage, $report->pbarurl);
+}
+
+/// TODO Print links to previous - next grade items in this course
+/// TODO Print Quick Edit Interface here
+/// TODO The teacher may only be allowed to view one group: check capabilities
+
+// print submit button
+echo '<div class="submit"><input type="submit" value="'.get_string('update').'" /></div>';
+echo '</div></form>';
+
+// prints paging bar at bottom for large pages
+if (!empty($studentsperpage) && $studentsperpage >= 20) {
+    print_paging_bar($numusers, $report->page, $studentsperpage, $report->pbarurl);
+}
+
+print_footer($course);
+?>
diff --git a/grade/report/stats.tar.bz2 b/grade/report/stats.tar.bz2
new file mode 100644
index 0000000000..85028e6bf4
Binary files /dev/null and b/grade/report/stats.tar.bz2 differ
diff --git a/grade/report/stats/README.txt b/grade/report/stats/README.txt
new file mode 100644
index 0000000000..0d0e1ce9bf
--- /dev/null
+++ b/grade/report/stats/README.txt
@@ -0,0 +1,104 @@
+ ____     __              __                ____                                      __
+/\  _`\  /\ \__          /\ \__            /\  _`\                                   /\ \__
+\ \,\L\_\\ \ ,_\     __  \ \ ,_\    ____   \ \ \L\ \      __   _____     ___    _ __ \ \ ,_\
+ \/_\__ \ \ \ \/   /'__`\ \ \ \/   /',__\   \ \ ,  /    /'__`\/\ '__`\  / __`\ /\`'__\\ \ \/
+   /\ \L\ \\ \ \_ /\ \L\.\_\ \ \_ /\__, `\   \ \ \\ \  /\  __/\ \ \L\ \/\ \L\ \\ \ \/  \ \ \_
+   \ `\____\\ \__\\ \__/.\_\\ \__\\/\____/    \ \_\ \_\\ \____\\ \ ,__/\ \____/ \ \_\   \ \__\
+    \/_____/ \/__/ \/__/\/_/ \/__/ \/___/      \/_/\/ / \/____/ \ \ \/  \/___/   \/_/    \/__/
+                                                                 \ \_\
+                                                                  \/_/
+	                                  ,+7$$Z$ZO= 
+	                    :+$$Z$$ZOZZZOOOOOOOOD,:,,,
+	                 +Z$ZOOO8OO8OOOOOOOOO8+====~~:,
+	               7$ZOOOOZOZOOOOOOOOOO8+++++=~:,
+	            77$88OZ8MMDZZZOOOOOOOZ+?++==~:,
+	         77Z$$Z8MM8OZOZZZZOOOO8ONDN+=~:,
+	       I7$Z$NMOOOOOO$$$ZZOOOOOD8D8D8:,
+	    II7$7MDZOOZZZZOZ$$ZZ$OOZNDNDDDD8DO         ,IIII777I~ 
+	 7?$$ZOMOOZZZ777MMMMMMMMMMMDNDN8DDDD$$7,   =+++++???IIII7777$? 
+	   ,,,:Z==++===7NMMMND8DDDMMD8DDDDD777777:?=~~~~==+++???II777$$$, 
+	    ,:DM~~~~::,O8ND8OO8Z$$$$DDDDDD7IIIIII+~~~=?I77$$$$77IIII77$$Z+, 
+	      ,8,,,,   ONND$ZZ$$777DDDDNDO$77II??+++I7$ZZOOOOZZ$77IIII7$ZZZ:,
+	       M,::,   O$D888ZO$II77DDD88OZ$7IIIIIII7$ZOO8OOOOOZ$77III77$ZO=:
+	      =M,,,    ?+~~+I$$$ZI778D$I?+=$77IIIII7$ZOO++===~~~$$7IIII7$ZOO~: 
+	      OM,,,    I?==?I7$O8D777?+=:,,:77I?III7ZOO++=~:,,,,:77I?II7$ZOO=~,
+	      8MI::,   I?=+II7$O8??+=~:,    77I?II7$ZOO+=~,      ?7I??II$ZOO+~: 
+	      ~M=~~,   I?++II7ZOO+=~,       II?+?I7$ZOO=~,       ,II+?II7ZOO+~: 
+	       M::~:   I?++II7ZOO+=:,       II++?I7$ZOO=~,        II++II7ZOO+~: 
+	       M,:~:   I?++II7ZOO+=:        II++?II$ZOO=~,        I?++II7ZOO+=: 
+	       M=::,   I?++II7ZOO+=:        II++?II$ZOO=~,        I?++II7ZOO+=:
+	       MI:::   I?++?I7ZOO+=:        II++?II$ZOO=~,        I?=+II7ZOO+=: 
+	      ,M?:~:   I?++?I7$OO+=:        II+=?II$ZOO=~,        I?=+II7ZOO+=:
+	      =M=:~:   I?++?I7$OO+=:        II+=?II$ZOO=~,        I?=+II7ZOO+=:
+	       M,:~:   I?++?I7$OO+=:        II+=?II$ZOO=~,        I?=+II7ZOO+~: 
+	       M,:~:   I?++?I7$OO+=:        II+=?II$ZOO=~,        I?=+II7ZOO+~: 
+	       M,::,   I?++?I7$OO+=:        II+=?II$ZOO=~,        I?=+II7ZOO+~: 
+	         ,:,   I?++?I7$OO+=:        II+=?II$ZOO=~,        I?=+II7ZOO+~: 
+	          ,    IIII77$ZOO+=:        IIIII77$OOO=~,        IIII77$ZOO+~:
+	               77$$ZZZOOO+=:        77$$ZZZOOOO=~,        77$ZZZOOOO+~:
+	               $ZOOOOOOOO+=:        $$ZOOOOOOOO=~,        $ZOOOOOOOO+=:
+
+
+=== About Stats Report ===
+The stats report gradebook plug-in was developed as part of a Google Summer of Code 2008
+project The goal of the plug-in is to provide a framework for providing text based
+statistics for grades in a course. Several statistics such as Highest, Lowest, Mean,
+Median, Mode, Percent Pass and Standard Deviation are included and new statistics can be
+easily dropped in by developers.
+
+
+=== About Author ===
+This plug-in was oringal created by a computer science student named Daniel Servos as part of
+a Google Summer of Code 2008 project.
+
+==== Contact Information ====
+Name: Daniel Servos
+E-mail: dservos@lakeheadu.ca
+Blog: HackerDan.com
+
+
+=== Copyright ===
+Moodle - Modular Object-Oriented Dynamic Learning Environment
+http://moodle.org
+
+Copyright (C) 1999 onwards  Martin Dougiamas  http://moodle.com
+
+This program is free software; you can redistribute it and/or modify it under the terms of the GNU
+General Public License as published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
+even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+General Public License for more details:
+
+http://www.gnu.org/copyleft/gpl.html
+
+
+=== Version / Release ===
+This plug-in was developed for Moodle 2.0 dev.
+
+This is the first real release of this plug-in and should be considered an beta version in that it
+has not yet had a chance to be extensively tested by users in real life situations and may have
+unknown bugs or issues.
+
+Version: 1.0.0b
+
+
+=== Development Information ===
+==== Adding new Statistics ====
+To add a new statistic to the plug-in extend the abstract class stats (grade/report/stats/statistics/stats.php) and place you class in a file name stat_yournamehere.php in  grade/report/stats/statistics and it should be automatically loaded in to plug-in.
+
+==== Specification ====
+http://docs.moodle.org/en/Student_projects/Animated_grade_statistics_report
+
+==== TO DO =====
+* Back port to Moodle 1.9.x
+* Add more statistics.
+* Add more settings for the report.
+* Improve look.
+* Add help windows/html.
+* Add report defaults page.
+* Deal with outcomes better/at all.
+* Add export functionality to different formats.
+* Improve this readme file.
+* Improve documentation.
\ No newline at end of file
diff --git a/grade/report/stats/arrayview.php b/grade/report/stats/arrayview.php
new file mode 100755
index 0000000000..53e76bf83a
--- /dev/null
+++ b/grade/report/stats/arrayview.php
@@ -0,0 +1,47 @@
+<?php
+///////////////////////////////////////////////////////////////////////////
+//                                                                       //
+// NOTICE OF COPYRIGHT                                                   //
+//                                                                       //
+// Moodle - Modular Object-Oriented Dynamic Learning Environment         //
+//          http://moodle.org                                            //
+//                                                                       //
+// Copyright (C) 1999 onwards  Martin Dougiamas  http://moodle.com       //
+//                                                                       //
+// This program is free software; you can redistribute it and/or modify  //
+// it under the terms of the GNU General Public License as published by  //
+// the Free Software Foundation; either version 2 of the License, or     //
+// (at your option) any later version.                                   //
+//                                                                       //
+// This program is distributed in the hope that it will be useful,       //
+// but WITHOUT ANY WARRANTY; without even the implied warranty of        //
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         //
+// GNU General Public License for more details:                          //
+//                                                                       //
+//          http://www.gnu.org/copyleft/gpl.html                         //
+//                                                                       //
+///////////////////////////////////////////////////////////////////////////
+
+/**
+ * Displays data from an array in the report/stats plugin.
+ * Array's data is encoded in the data param using the
+ * grade_report_stats::encode_array function.
+ * TODO: Improve look.
+ * @package gradebook
+ */
+
+require_once '../../../config.php';
+
+$rawdata = required_param('data');
+$courseid = required_param('id');
+
+$data = explode('"', stripslashes(base64_decode(strtr($rawdata, '-_,', '+/='))));
+$context = get_context_instance(CONTEXT_COURSE, $courseid);
+
+require_login($courseid);
+require_capability('gradereport/stats:view', $context);
+
+foreach($data as $stat) {
+    echo format_text($stat, FORMAT_HTML) . '<br/>';
+}
+?>
diff --git a/grade/report/stats/db/access.php b/grade/report/stats/db/access.php
new file mode 100755
index 0000000000..f4fe096b3f
--- /dev/null
+++ b/grade/report/stats/db/access.php
@@ -0,0 +1,115 @@
+<?php
+///////////////////////////////////////////////////////////////////////////
+//                                                                       //
+// NOTICE OF COPYRIGHT                                                   //
+//                                                                       //
+// Moodle - Modular Object-Oriented Dynamic Learning Environment         //
+//          http://moodle.org                                            //
+//                                                                       //
+// Copyright (C) 1999 onwards  Martin Dougiamas  http://moodle.com       //
+//                                                                       //
+// This program is free software; you can redistribute it and/or modify  //
+// it under the terms of the GNU General Public License as published by  //
+// the Free Software Foundation; either version 2 of the License, or     //
+// (at your option) any later version.                                   //
+//                                                                       //
+// This program is distributed in the hope that it will be useful,       //
+// but WITHOUT ANY WARRANTY; without even the implied warranty of        //
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         //
+// GNU General Public License for more details:                          //
+//                                                                       //
+//          http://www.gnu.org/copyleft/gpl.html                         //
+//                                                                       //
+///////////////////////////////////////////////////////////////////////////
+
+$gradereport_stats_capabilities = array(
+    'gradereport/stats:view' => array(
+        'riskbitmask' => RISK_PERSONAL,
+        'captype' => 'read',
+        'contextlevel' => CONTEXT_COURSE,
+        'legacy' => array(
+            'teacher' => CAP_ALLOW,
+            'editingteacher' => CAP_ALLOW,
+            'admin' => CAP_ALLOW
+        )
+    ),
+    'gradereport/stats:stat:lowest' => array(
+        'riskbitmask' => RISK_PERSONAL,
+        'captype' => 'read',
+        'contextlevel' => CONTEXT_COURSE,
+        'legacy' => array(
+            'student' => CAP_ALLOW,
+            'teacher' => CAP_ALLOW,
+            'editingteacher' => CAP_ALLOW,
+            'admin' => CAP_ALLOW
+        )
+    ),
+    'gradereport/stats:stat:highest' => array(
+        'riskbitmask' => RISK_PERSONAL,
+        'captype' => 'read',
+        'contextlevel' => CONTEXT_COURSE,
+        'legacy' => array(
+            'student' => CAP_ALLOW,
+            'teacher' => CAP_ALLOW,
+            'editingteacher' => CAP_ALLOW,
+            'admin' => CAP_ALLOW
+        )
+    ),
+    'gradereport/stats:stat:passpercent' => array(
+        'riskbitmask' => RISK_PERSONAL,
+        'captype' => 'read',
+        'contextlevel' => CONTEXT_COURSE,
+        'legacy' => array(
+            'student' => CAP_ALLOW,
+            'teacher' => CAP_ALLOW,
+            'editingteacher' => CAP_ALLOW,
+            'admin' => CAP_ALLOW
+        )
+    ),
+    'gradereport/stats:stat:standarddeviation' => array(
+        'riskbitmask' => RISK_PERSONAL,
+        'captype' => 'read',
+        'contextlevel' => CONTEXT_COURSE,
+        'legacy' => array(
+            'student' => CAP_ALLOW,
+            'teacher' => CAP_ALLOW,
+            'editingteacher' => CAP_ALLOW,
+            'admin' => CAP_ALLOW
+        )
+    ),
+    'gradereport/stats:stat:mean' => array(
+        'riskbitmask' => RISK_PERSONAL,
+        'captype' => 'read',
+        'contextlevel' => CONTEXT_COURSE,
+        'legacy' => array(
+            'student' => CAP_ALLOW,
+            'teacher' => CAP_ALLOW,
+            'editingteacher' => CAP_ALLOW,
+            'admin' => CAP_ALLOW
+        )
+    ),
+    'gradereport/stats:stat:median' => array(
+        'riskbitmask' => RISK_PERSONAL,
+        'captype' => 'read',
+        'contextlevel' => CONTEXT_COURSE,
+        'legacy' => array(
+            'student' => CAP_ALLOW,
+            'teacher' => CAP_ALLOW,
+            'editingteacher' => CAP_ALLOW,
+            'admin' => CAP_ALLOW
+        )
+    ),
+    'gradereport/stats:stat:mode' => array(
+        'riskbitmask' => RISK_PERSONAL,
+        'captype' => 'read',
+        'contextlevel' => CONTEXT_COURSE,
+        'legacy' => array(
+            'student' => CAP_ALLOW,
+            'teacher' => CAP_ALLOW,
+            'editingteacher' => CAP_ALLOW,
+            'admin' => CAP_ALLOW
+        )
+    )
+);
+
+?>
diff --git a/grade/report/stats/index.php b/grade/report/stats/index.php
new file mode 100755
index 0000000000..1e9cb9cc9f
--- /dev/null
+++ b/grade/report/stats/index.php
@@ -0,0 +1,94 @@
+<?php
+///////////////////////////////////////////////////////////////////////////
+//                                                                       //
+// NOTICE OF COPYRIGHT                                                   //
+//                                                                       //
+// Moodle - Modular Object-Oriented Dynamic Learning Environment         //
+//          http://moodle.org                                            //
+//                                                                       //
+// Copyright (C) 1999 onwards  Martin Dougiamas  http://moodle.com       //
+//                                                                       //
+// This program is free software; you can redistribute it and/or modify  //
+// it under the terms of the GNU General Public License as published by  //
+// the Free Software Foundation; either version 2 of the License, or     //
+// (at your option) any later version.                                   //
+//                                                                       //
+// This program is distributed in the hope that it will be useful,       //
+// but WITHOUT ANY WARRANTY; without even the implied warranty of        //
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         //
+// GNU General Public License for more details:                          //
+//                                                                       //
+//          http://www.gnu.org/copyleft/gpl.html                         //
+//                                                                       //
+///////////////////////////////////////////////////////////////////////////
+
+/**
+ * Index page for the stats report plugin.
+ * Based on the grader report plugin but
+ * for text based statistics.
+ * @package gradebook
+ */
+
+require_once '../../../config.php';
+require_once $CFG->libdir.'/gradelib.php';
+require_once $CFG->dirroot.'/grade/lib.php';
+require_once $CFG->dirroot.'/grade/report/stats/lib.php';
+
+$courseid = required_param('id');
+$toggle = optional_param('toggle', NULL, PARAM_INT);
+$toggle_type = optional_param('toggle_type', 0, PARAM_ALPHANUM);
+
+/// basic access checks
+$course = $DB->get_record('course', array('id' => $courseid));
+
+if (!$course) {
+    print_error('nocourseid');
+}
+
+require_login($course);
+$context = get_context_instance(CONTEXT_COURSE, $course->id);
+require_capability('gradereport/stats:view', $context);
+
+/// get tracking object
+$gpr = new grade_plugin_return(array('type'=>'report', 'plugin'=>'stats', 'courseid'=>$courseid));
+
+/// last selected report session tracking
+if (!isset($USER->grade_last_report)) {
+    $USER->grade_last_report = array();
+}
+$USER->grade_last_report[$course->id] = 'stats';
+
+/// Build navigation
+$strgrades  = get_string('grades');
+$reportname = get_string('modulename', 'gradereport_stats');
+$navigation = grade_build_nav(__FILE__, $reportname, $courseid);
+
+/// Handle toggle change request
+if (!is_null($toggle) && !empty($toggle_type)) {
+    set_user_preferences(array('grade_report_statsshow'.$toggle_type => $toggle));
+}
+
+grade_regrade_final_grades($courseid);
+
+/// Get report object
+$report = new grade_report_stats($courseid, $gpr, $context);
+
+print_grade_page_head($courseid, 'report', 'stats', $reportname);
+
+/// Build report to output
+$report->load_users();
+$report->harvest_data();
+$report->report_data();
+$report->adapt_data();
+
+/// Print report
+echo $report->group_selector;
+echo '<div class="clearer"></div>';
+echo $report->get_toggles_html();
+echo '<div class="clearer"></div>';
+echo $report->html;
+
+/// Print footer
+print_footer($course);
+
+?>
diff --git a/grade/report/stats/lang/en_utf8/gradereport_stats.php b/grade/report/stats/lang/en_utf8/gradereport_stats.php
new file mode 100755
index 0000000000..978520520f
--- /dev/null
+++ b/grade/report/stats/lang/en_utf8/gradereport_stats.php
@@ -0,0 +1,79 @@
+<?php
+///////////////////////////////////////////////////////////////////////////
+//                                                                       //
+// NOTICE OF COPYRIGHT                                                   //
+//                                                                       //
+// Moodle - Modular Object-Oriented Dynamic Learning Environment         //
+//          http://moodle.org                                            //
+//                                                                       //
+// Copyright (C) 1999 onwards  Martin Dougiamas  http://moodle.com       //
+//                                                                       //
+// This program is free software; you can redistribute it and/or modify  //
+// it under the terms of the GNU General Public License as published by  //
+// the Free Software Foundation; either version 2 of the License, or     //
+// (at your option) any later version.                                   //
+//                                                                       //
+// This program is distributed in the hope that it will be useful,       //
+// but WITHOUT ANY WARRANTY; without even the implied warranty of        //
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         //
+// GNU General Public License for more details:                          //
+//                                                                       //
+//          http://www.gnu.org/copyleft/gpl.html                         //
+//                                                                       //
+///////////////////////////////////////////////////////////////////////////
+
+$string['modulename'] = 'Stats report';
+$string['stats:view'] = 'View course stats report';
+
+$string['moredata']='Stats Report: More Data';
+
+$string['range'] = 'Range';
+$string['overall'] = 'Course total';
+$string['num_grades'] = 'Grades';
+
+$string['showranges'] = 'Show ranges';
+$string['showgroups'] = 'Show groups';
+$string['shownumgrades'] = 'Show number of grades';
+$string['showinverted'] = 'Invert Table';
+$string['hideranges'] = 'Hide ranges';
+$string['hidegroups'] = 'Hide groups';
+$string['hidenumgrades'] = 'Hide number of grades';
+$string['hideinverted'] = 'Invert Table';
+
+$string['statsshow'] = 'Show';
+
+$string['statistic'] = 'Statistic';
+$string['highest'] = 'Highest';
+$string['lowest'] = 'Lowest';
+$string['median'] = 'Median';
+$string['average'] = 'Average';
+$string['mean'] = 'Mean';
+$string['mode'] = 'Mode';
+$string['standarddeviation'] = 'Standard Deviation';
+$string['pass_percent'] = 'Percent Pass';
+
+$string['stats:stat:lowest'] ='Show Lowest Statistic';
+$string['stats:stat:highest'] = 'Show Highest Statistic';
+$string['stats:stat:passpercent'] = 'Show Percent Pass Statistic';
+$string['stats:stat:standarddeviation'] = 'Show Standard Deviation Statistic';
+$string['stats:stat:mean'] = 'Show Mean Statistic';
+$string['stats:stat:median'] = 'Show Median Statistic';
+$string['stats:stat:mode'] = 'Show Mode Statistic';
+
+$string['prefgeneral'] = 'General';
+$string['prefshow']= 'Show/hide toggles';
+$string['prefcalc'] = 'Calculations';
+$string['prefstats'] = 'Statistics';
+
+$string['aggregationview'] = 'Aggregation view';
+$string['aggregationposition'] = 'Aggregation position';
+
+$string['showscaleitems'] = 'Show items using scale';
+$string['showvalueitems'] = 'Show items using value';
+
+$string['incompleasmin'] = 'Incomplete grades as min';
+$string['usehidden'] = 'Count hidden grades';
+$string['uselocked'] = 'Count locked grades';
+
+$string['printable'] = 'Printer Friendly Version';
+?>
\ No newline at end of file
diff --git a/grade/report/stats/lib.php b/grade/report/stats/lib.php
new file mode 100755
index 0000000000..976a714c98
--- /dev/null
+++ b/grade/report/stats/lib.php
@@ -0,0 +1,573 @@
+ <?php
+ ///////////////////////////////////////////////////////////////////////////
+//                                                                       //
+// NOTICE OF COPYRIGHT                                                   //
+//                                                                       //
+// Moodle - Modular Object-Oriented Dynamic Learning Environment         //
+//          http://moodle.org                                            //
+//                                                                       //
+// Copyright (C) 1999 onwards  Martin Dougiamas  http://moodle.com       //
+//                                                                       //
+// This program is free software; you can redistribute it and/or modify  //
+// it under the terms of the GNU General Public License as published by  //
+// the Free Software Foundation; either version 2 of the License, or     //
+// (at your option) any later version.                                   //
+//                                                                       //
+// This program is distributed in the hope that it will be useful,       //
+// but WITHOUT ANY WARRANTY; without even the implied warranty of        //
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         //
+// GNU General Public License for more details:                          //
+//                                                                       //
+//          http://www.gnu.org/copyleft/gpl.html                         //
+//                                                                       //
+///////////////////////////////////////////////////////////////////////////
+
+ /**
+  * File in which the grade_report_stats class is defined.
+  * @package gradebook
+  */
+
+require_once($CFG->dirroot . '/grade/report/lib.php');
+require_once($CFG->libdir.'/tablelib.php');
+
+foreach (glob($CFG->dirroot . '/grade/report/stats/statistics/stat_*.php') as $filename) {
+   require_once($filename);
+}
+
+/**
+ * Class providing the API for the stats report, including harvesters,
+ * reports, and adaptor methods for turing grades in to statistics.
+ * @uses grade_report
+ * @package gradebook
+ */
+class grade_report_stats extends grade_report {
+    /**
+     * Capability to view hidden items.
+     * @var bool $canviewhidden
+     */
+    private $canviewhidden;
+
+    /**
+     * Grade objects of users in the course
+     * @var array $grades
+     */
+    private $grades = array();
+
+    /**
+     * Array of users final grades affter filtered based on
+     * settings.
+     * @var array $finalgrades
+     */
+    private $finalgrades = array();
+
+    /**
+     * The value returned from each statistic.
+     * @var array $reportedstats
+     */
+    private $reportedstats = array();
+
+    /**
+     * The html of the report to output.
+     * @var string $html
+     */
+    public $html;
+
+    /**
+     * The table class used to make the html of the report.
+     * @var object $table
+     */
+     private $table;
+
+     /**
+      * Array of clases that extend stats witch have the logic to
+      * generate the statstics.
+      * @var array $stats
+      */
+     private static $stats = array();
+
+    /**
+     * Constructor. Initialises grade_tree, sets up group, baseurl
+     * and pbarurl.
+     * @param int $courseid the coures id for the report
+     * @param object $gpr grade plugin tracking object
+     * @context string $context
+     */
+    public function __construct($courseid, $gpr, $context) {
+        global $CFG;
+        parent::__construct($courseid, $gpr, $context, null);
+
+        $this->canviewhidden = has_capability('moodle/grade:viewhidden', get_context_instance(CONTEXT_COURSE, $this->course->id));
+
+        /// Set up urls
+        $this->baseurl = 'index.php?id=' . $this->courseid;
+        $this->pbarurl = 'index.php?id=' . $this->courseid;
+
+        /// Set the position of the aggregation categorie based on pref
+        $switch = $this->get_pref('statsaggregationposition');
+        if ($switch == '' && isset($CFG->grade_aggregationposition)) {
+            $switch = grade_get_setting($this->courseid, 'aggregationposition', $CFG->grade_aggregationposition);
+        }
+
+        /// Build grade tree
+        $this->gtree = new grade_tree($this->courseid, false, $switch);
+
+        $this->course->groupmode = 2;
+        /// Set up Groups
+        if ($this->get_pref('statsshowgroups') || is_null($this->get_pref('statsshowgroups'))) {
+            $this->setup_groups();
+        }
+
+        /// Load stats classes from ./statistics
+        $this->load_stats();
+    }
+
+    /**
+     * Load all the stats classes into $stats.
+     * Looks in /statistics and trys to make an instence of any
+     * class that is in a file that starts with stats_ and extends
+     * stats directly.
+     * @param bool $return if true return stats array, else store in $this->stats
+     * @returns array array of clases that extend stats
+     */
+    private function load_stats($return=false) {
+        global $CFG;
+
+        $stats = array();
+
+        foreach (glob($CFG->dirroot . '/grade/report/stats/statistics/stat_*.php') as $path) {
+            $filename = substr(basename($path, '.php'), 5);
+
+            if(class_exists($filename) && get_parent_class($class = new $filename) == 'stats' ) {
+                $stats[$filename] = $class;
+            }
+        }
+
+        if($return) {
+            return $stats;
+        } else {
+            grade_report_stats::$stats = $stats;
+        }
+    }
+
+    /**
+     * Returns the current stats being used in the report or if no stats are
+     * set, it returns the stats as whould be loaded by load_stats.
+     * @returns array array of classes that extend stats
+     */
+    public function get_stats() {
+        if(!isset(grade_report_stats::$stats) || is_null(grade_report_stats::$stats) || empty(grade_report_stats::$stats)) {
+            return grade_report_stats::load_stats(true);
+        } else {
+            return grade_report_stats::$stats;
+        }
+    }
+
+    /// Added to keep grade_report happy
+    public function process_data($data){}
+    public function process_action($target, $action){}
+
+    /**
+     * Based on load user function from grader report.
+     * Pulls out the userids of the users to be used in the stats.
+     * @return array array of user ids to use in stats
+     */
+    public function load_users() {
+        global $CFG, $DB;
+
+        $params = array();
+        list($usql, $gbr_params) = $DB->get_in_or_equal(explode(',', $this->gradebookroles), SQL_PARAMS_NAMED);
+
+        $sql = "SELECT u.id
+                FROM {user} u
+                    JOIN {role_assignments} ra ON u.id = ra.userid
+                    $this->groupsql
+                WHERE ra.roleid $usql
+                    $this->groupwheresql
+                    AND ra.contextid ".get_related_contexts_string($this->context);
+
+        $params = array_merge($gbr_params, $this->groupwheresql_params);
+
+        $this->users = $DB->get_records_sql($sql, $params);
+
+        if (empty($this->users)) {
+            $this->userselect = '';
+            $this->users = array();
+            $this->userselect_params = array();
+        } else {
+            if(isset($DB) && !is_null($DB)) {
+                list($usql, $params) = $DB->get_in_or_equal(array_keys($this->users));
+                $this->userselect = "AND g.userid $usql";
+                $this->userselect_params = $params;
+            }else{
+                $this->userselect = 'AND g.userid in ('.implode(',', array_keys($this->users)).')';
+            }
+        }
+
+        return $this->users;
+    }
+
+    /**
+     * Encode an array of stat's data in to a stirng so it can
+     * be put in the get part of a url.
+     * @param arrray $array array of data to encode
+     * @param object $item grade_item to use to fromat stats
+     * @param object $stat stats object to use to format stats
+     * @return string encoded string
+     */
+    private function encode_array(array $array, $item, $stat) {
+        $string = '';
+
+        /// Encode each elment by puting a delimiter and base64 encoding it.
+        foreach($array as $id=>$data) {
+            $string .= addslashes(grade_format_gradevalue($data, $item, true, $stat->displaytype, $stat->decimals)) . '"';
+        }
+        return strtr(base64_encode($string), '+/=', '-_,');
+    }
+
+    /**
+     * Harvest the grades from the data base and build the finalgrades array.
+     * Filters out hidden, locked and null grades based on users settings.
+     * Partly based on grader reports load_final_grades function.
+     */
+    public function harvest_data() {
+        global $CFG, $DB;
+
+        $params = array();
+
+        if(isset($DB) && !is_null($DB)) {
+            $params = array_merge(array($this->courseid), $this->userselect_params);
+
+            /// please note that we must fetch all grade_grades fields if we want to contruct grade_grade object from it!
+            $sql = "SELECT g.*
+                  FROM {grade_items} gi,
+                       {grade_grades} g
+                 WHERE g.itemid = gi.id AND gi.courseid = ? {$this->userselect}";
+
+            $grades = $DB->get_records_sql($sql, $params);
+        } else {
+            /// please note that we must fetch all grade_grades fields if we want to contruct grade_grade object from it!
+            $sql = "SELECT g.*
+                  FROM {$CFG->prefix}grade_items gi,
+                       {$CFG->prefix}grade_grades g
+                 WHERE g.itemid = gi.id AND gi.courseid = {$this->courseid} {$this->userselect}";
+
+            $grades = get_records_sql($sql);
+        }
+
+        $userids = array_keys($this->users);
+
+        if ($grades) {
+            foreach ($grades as $graderec) {
+                if (in_array($graderec->userid, $userids) and array_key_exists($graderec->itemid, $this->gtree->items)) { // some items may not be present!!
+                    $this->grades[$graderec->itemid][$graderec->userid] = new grade_grade($graderec, false);
+                    $this->grades[$graderec->itemid][$graderec->userid]->grade_item =& $this->gtree->items[$graderec->itemid]; // db caching
+                }
+            }
+        }
+
+        /// prefil grades that do not exist yet
+        foreach ($userids as $userid) {
+            foreach ($this->gtree->items as $itemid=>$unused) {
+                if (!isset($this->grades[$itemid][$userid])) {
+                    $this->grades[$itemid][$userid] = new grade_grade();
+                    $this->grades[$itemid][$userid]->itemid = $itemid;
+                    $this->grades[$itemid][$userid]->userid = $userid;
+                    $this->grades[$itemid][$userid]->grade_item =& $this->gtree->items[$itemid]; // db caching
+                }
+            }
+        }
+
+        $this->finalgrades = array();
+
+        /// Build finalgrades array and filliter out unwanted grades.
+        foreach ($this->gtree->items as $id=>$item) {
+            if(($item->gradetype == GRADE_TYPE_SCALE &&  ($this->get_pref('statsshowscaleitems') || is_null($this->get_pref('statsshowscaleitems'))))
+                || ($item->gradetype == GRADE_TYPE_VALUE &&  ($this->get_pref('statsshowvalueitems') || is_null($this->get_pref('statsshowvalueitems'))))) {
+                    $this->finalgrades[$id] = array();
+                    $i = 0;
+
+                    if(isset($this->grades[$id]) && !is_null($this->grades[$id])) {
+                        foreach ($this->grades[$id] as $grade) {
+                            if( (($grade->is_hidden() &&  $this->canviewhidden && ($this->get_pref('statsusehidden') || is_null($this->get_pref('statsusehidden')))) || !$grade->is_hidden())
+                                && (($grade->is_locked() && ($this->get_pref('statsuselocked') || is_null($this->get_pref('statsuselocked')))) || !$grade->is_locked())) {
+                                    if($this->get_pref('statsincompleasmin') && is_null($grade->finalgrade)) {
+                                        $this->finalgrades[$id][$i] = $item->grademin;
+                                        $i++;
+                                    } elseif(!is_null($grade->finalgrade)) {
+                                        $this->finalgrades[$id][$i] = $grade->finalgrade;
+                                        $i++;
+                                    }
+                            }
+                        }
+                    }
+                }
+        }
+    }
+
+    /**
+     * Runs grades for each item threw the report functions
+     * of each stats class in $stats and stores the values in
+     * reportedstats.
+     */
+    public function report_data() {
+        $this->reportedstats = array();
+
+        foreach(grade_report_stats::$stats as $name=>$stat) {
+            if(($stat->capability == null || has_capability($stat->capability, $this->context)) && ($this->get_pref('stats'. $name) || is_null($this->get_pref('stats'. $name)))) {
+                $this->reportedstats[$name] = array();
+
+                foreach($this->finalgrades as $itemid=>$item) {
+                    sort($item);
+                    if(count($item) > 0) {
+                        $this->reportedstats[$name][$itemid] = $stat->report_data($item, $this->gtree->items[$itemid]);
+                    } else {
+                        $this->reportedstats[$name][$itemid] = null;
+                    }
+                }
+            }
+        }
+    }
+
+    /**
+     * Take the reported data and adapt it in to HTML to output.
+     * HTML is stored in html.
+     * TODO: Deal with tables growing to wide.
+     * TODO: Make it look nice.
+     */
+    public function adapt_data($printerversion = false) {
+        global $CFG;
+
+        $inverted = $this->get_pref('statsshowinverted');
+
+        /// Set up table arrays
+        $tablecolumns = array('statistic');
+        $tableheaders = array($this->get_lang_string('statistic', 'gradereport_stats'));
+
+        /// Loop threw items and build arrays
+        if ($inverted) {
+            if($this->get_pref('statsshowranges')) {
+                array_push($tablecolumns, 'range');
+                array_push($tableheaders, $this->get_lang_string('range', 'gradereport_stats'));
+            }
+
+            foreach($this->reportedstats as $name=>$data) {
+                array_push($tablecolumns, $name);
+                array_push($tableheaders, grade_report_stats::$stats[$name]->name);
+            }
+
+            if($this->get_pref('statsshownumgrades')) {
+                array_push($tablecolumns, 'num_grades');
+                array_push($tableheaders, $this->get_lang_string('num_grades', 'gradereport_stats'));
+            }
+        } else {
+            /// Set up range column and number of grades column
+            $ranges = array(format_text('<strong>' . $this->get_lang_string('range', 'gradereport_stats') . '</strong>', FORMAT_HTML));
+            $numgrades = array(format_text('<strong>' . $this->get_lang_string('num_grades', 'gradereport_stats') . '</strong>', FORMAT_HTML));
+
+            foreach($this->finalgrades as $itemid=>$grades) {
+                array_push($tablecolumns, $itemid);
+                array_push($tableheaders,  format_text($this->gtree->items[$itemid]->get_name(), FORMAT_HTML));
+                array_push($ranges, format_text('<strong>' . grade_format_gradevalue($this->gtree->items[$itemid]->grademin, $this->gtree->items[$itemid], true) . '-' . grade_format_gradevalue($this->gtree->items[$itemid]->grademax, $this->gtree->items[$itemid], true) . '</strong>' , FORMAT_HTML));
+                array_push($numgrades, format_text(count($grades), FORMAT_HTML));
+            }
+        }
+
+        /// Set up flexible table
+        $this->table = new flexible_table('grade-report-stats-' . $this->courseid);
+        $this->table->define_columns($tablecolumns);
+        $this->table->define_headers($tableheaders);
+       if ($printerversion) {
+            $this->table->collapsible(false);
+            $this->table->set_attribute('cellspacing', '1');
+            $this->table->set_attribute('border', '1');
+        } else {
+            $this->table->define_baseurl($this->baseurl);
+            $this->table->collapsible(true);
+            $this->table->set_attribute('cellspacing', '1');
+            $this->table->set_attribute('id', 'stats-grade');
+            $this->table->set_attribute('class', 'grade-report-stats gradestable flexible');
+        }
+        $this->table->setup();
+
+        /// If ranges are being shown add them to the table
+        if(!$inverted){
+            if ($this->get_pref('statsshowranges')){
+                $this->table->add_data($ranges);
+                $this->table->add_separator();
+            }
+        }
+
+        /// Loop threw all the reported data and format it in to cells
+        /// If stat retured an array of values display the elements or
+        /// make a link to a popup with the data in it.
+        if($inverted) {
+            foreach($this->finalgrades as $itemid=>$grades) {
+                $item = $this->gtree->items[$itemid];
+                $row = array(format_text('<strong>' . $item->get_name() . '</strong>' , FORMAT_HTML));
+
+                if($this->get_pref('statsshowranges')) {
+                    array_push($row, format_text('<strong>' . grade_format_gradevalue($item->grademin, $item, true) . '-' . grade_format_gradevalue($item->grademax, $item, true) . '</strong>' , FORMAT_HTML));
+                }
+
+                foreach($this->reportedstats as $name=>$data) {
+                    $stat = $data[$itemid];
+
+                    if(!is_array($stat)) {
+                        array_push($row, format_text(grade_format_gradevalue($stat, $item, true, grade_report_stats::$stats[$name]->displaytype, grade_report_stats::$stats[$name]->decimals), FORMAT_HTML));
+                    } else {
+                        $statstring = "";
+
+                        for($i = 0; $i < 2; $i++) {
+                            if($i >= count($stat)) {
+                                break;
+                            }
+                            $statstring .= grade_format_gradevalue($stat[$i], $item, true, grade_report_stats::$stats[$name]->displaytype, grade_report_stats::$stats[$name]->decimals) . ', ';
+                        }
+
+                        if($i < count($stat)) {
+                            if(!$printerversion) {
+                                $statstring = "<a href=\"#\" onClick=\"javascript:window.open('{$CFG->wwwroot}/grade/report/stats/arrayview.php?id={$this->courseid}&data={$this->encode_array($stat, $item, grade_report_stats::$stats[$name])}','{$this->get_lang_string('moredata', 'gradereport_stats')}','width=300,height=500,menubar=no,status=no,location=no,directories=no,toolbar=no,scrollbars=yes');\">". format_text($statstring, FORMAT_HTML) . '....</a>';
+                            } else {
+                                    $statstring .= '...';
+                            }
+                        } else {
+                            $statstring = substr($statstring, 0, strlen($statstring) - 2);
+                        }
+                        array_push($row, $statstring);
+                    }
+                }
+
+                if($this->get_pref('statsshownumgrades')) {
+                    array_push($row, format_text(count($grades), FORMAT_HTML));
+                }
+
+                $this->table->add_data($row);
+            }
+        } else {
+            foreach($this->reportedstats as $name=>$data) {
+                $row = array(format_text('<strong>' . grade_report_stats::$stats[$name]->name . '</strong>', FORMAT_HTML));
+
+                foreach($data as $itemid=>$stat) {
+                    if(!is_array($stat)) {
+                        array_push($row, format_text(grade_format_gradevalue($stat, $this->gtree->items[$itemid], true, grade_report_stats::$stats[$name]->displaytype, grade_report_stats::$stats[$name]->decimals), FORMAT_HTML));
+                    } else {
+                        $statstring = "";
+
+                        for($i = 0; $i < 2; $i++) {
+                            if($i >= count($stat)) {
+                                break;
+                            }
+                            $statstring .= grade_format_gradevalue($stat[$i], $this->gtree->items[$itemid], true, grade_report_stats::$stats[$name]->displaytype, grade_report_stats::$stats[$name]->decimals) . ', ';
+                        }
+
+                        if($i < count($stat)) {
+                            if(!$printerversion) {
+                                $statstring = "<a href=\"#\" onClick=\"javascript:window.open('{$CFG->wwwroot}/grade/report/stats/arrayview.php?id={$this->courseid}&data={$this->encode_array($stat, $this->gtree->items[$itemid], grade_report_stats::$stats[$name])}','{$this->get_lang_string('moredata', 'gradereport_stats')}','width=300,height=500,menubar=no,status=no,location=no,directories=no,toolbar=no,scrollbars=yes');\">". format_text($statstring, FORMAT_HTML) . '....</a>';
+                            } else {
+                                    $statstring .= '...';
+                            }
+                        } else {
+                            $statstring = substr($statstring, 0, strlen($statstring) - 2);
+                        }
+                        array_push($row, $statstring);
+                    }
+                }
+                $this->table->add_data($row);
+            }
+        }
+
+        /// If the number of grades is being shown add it to the table.
+        if(!$inverted) {
+            if ($this->get_pref('statsshownumgrades')){
+                $this->table->add_separator();
+                $this->table->add_data($numgrades);
+            }
+        }
+
+        /// Build html
+        ob_start();
+            if($this->currentgroup == 0) {
+                echo format_text('<strong>Group:</strong> All participants', FORMAT_HTML);
+            } else {
+                echo format_text('<strong>Group:</strong> ' . groups_get_group_name($this->currentgroup), FORMAT_HTML);
+            }
+            $this->table->print_html();
+        $this->html = ob_get_clean();
+    }
+
+    /**
+     * Builds HTML for toggles on top of report.
+     * Based on grader report  get_toggles_html
+     * @return string html code for toggles.
+     */
+    public function get_toggles_html() {
+        global $CFG, $USER;
+
+        $html = '<div id="stats-report-toggles" style="vertical-align: text-top; text-align: center;">';
+        $html .= $this->print_toggle('numgrades', true);
+        $html .= $this->print_toggle('groups', true);
+        $html .= $this->print_toggle('ranges', true);
+        $html .= $this->print_toggle('inverted', true);
+        $html .= '</div>';
+
+        return $html;
+    }
+
+    /**
+     * Builds HTML for each individual toggle.
+     * Based on grader report print_toggle
+     * @param string $type The toggle type.
+     * @param bool $return Wheather ro return the HTML or print it.
+     */
+    private function print_toggle($type, $return=false) {
+        global $CFG;
+
+        $icons = array('eyecons' => 't/hide.gif',
+                       'numgrades' => 't/grades.gif',
+                       'calculations' => 't/calc.gif',
+                       'locks' => 't/lock.gif',
+                       'averages' => 't/mean.gif',
+                       'inverted' => 't/switch_whole.gif',
+                       'nooutcomes' => 't/outcomes.gif');
+
+        $pref_name = 'grade_report_statsshow' . $type;
+
+        if (array_key_exists($pref_name, $CFG)) {
+            $show_pref = get_user_preferences($pref_name, $CFG->$pref_name);
+        } else {
+            $show_pref = get_user_preferences($pref_name);
+        }
+
+        $strshow = $this->get_lang_string('show' . $type, 'gradereport_stats');
+        $strhide = $this->get_lang_string('hide' . $type, 'gradereport_stats');
+
+        $show_hide = 'show';
+        $toggle_action = 1;
+
+        if ($show_pref) {
+            $show_hide = 'hide';
+            $toggle_action = 0;
+        }
+
+        if (array_key_exists($type, $icons)) {
+            $image_name = $icons[$type];
+        } else {
+            $image_name = "t/$type.gif";
+        }
+
+        $string = ${'str' . $show_hide};
+
+        $img = '<img src="'.$CFG->pixpath.'/'.$image_name.'" class="iconsmall" alt="'
+                      .$string.'" title="'.$string.'" />'. "\n";
+
+        $retval = $img . '<a href="' . $this->baseurl . "&amp;toggle=$toggle_action&amp;toggle_type=$type\">"
+             . format_text($string, FORMAT_HTML) . '</a> ';
+
+        if ($return) {
+            return $retval;
+        } else {
+            echo $retval;
+        }
+    }
+}
+?>
diff --git a/grade/report/stats/preferences.php b/grade/report/stats/preferences.php
new file mode 100755
index 0000000000..05c1f1e44e
--- /dev/null
+++ b/grade/report/stats/preferences.php
@@ -0,0 +1,95 @@
+<?php
+///////////////////////////////////////////////////////////////////////////
+//                                                                       //
+// NOTICE OF COPYRIGHT                                                   //
+//                                                                       //
+// Moodle - Modular Object-Oriented Dynamic Learning Environment         //
+//          http://moodle.org                                            //
+//                                                                       //
+// Copyright (C) 1999 onwards  Martin Dougiamas  http://moodle.com       //
+//                                                                       //
+// This program is free software; you can redistribute it and/or modify  //
+// it under the terms of the GNU General Public License as published by  //
+// the Free Software Foundation; either version 2 of the License, or     //
+// (at your option) any later version.                                   //
+//                                                                       //
+// This program is distributed in the hope that it will be useful,       //
+// but WITHOUT ANY WARRANTY; without even the implied warranty of        //
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         //
+// GNU General Public License for more details:                          //
+//                                                                       //
+//          http://www.gnu.org/copyleft/gpl.html                         //
+//                                                                       //
+///////////////////////////////////////////////////////////////////////////
+
+/**
+ * Preferences page for the stats report plugin.
+ * Based on the grader report plugin.
+ * @package gradebook
+ */
+
+require_once '../../../config.php';
+require_once $CFG->libdir . '/gradelib.php';
+require_once $CFG->dirroot.'/grade/lib.php';
+
+$courseid = required_param('id', PARAM_INT);
+
+
+/// Make sure they can even access this course
+if(isset($DB) && !is_null($DB)) {
+    $course = $DB->get_record('course', array('id' => $courseid));
+} else {
+    $course = get_record('course', 'id', $courseid);
+}
+
+if (!$course) {
+    print_error('nocourseid');
+}
+
+require_login($course->id);
+
+$context = get_context_instance(CONTEXT_COURSE, $course->id);
+$systemcontext = get_context_instance(CONTEXT_SYSTEM);
+require_capability('gradereport/stats:view', $context);
+
+
+require('preferences_form.php');
+$mform = new stats_report_preferences_form('preferences.php', compact('course'));
+
+// If data submitted, then process and store.
+if ($data = $mform->get_data()) {
+    foreach ($data as $preference => $value) {
+        if (substr($preference, 0, 18) !== 'grade_report_stats') {
+            continue;
+        }
+
+        if ($value == GRADE_REPORT_PREFERENCE_DEFAULT || strlen($value) == 0) {
+            unset_user_preference($preference);
+        } else {
+            set_user_preference($preference, $value);
+        }
+    }
+}
+
+/// If cancelled go back to report
+if ($mform->is_cancelled()){
+    redirect($CFG->wwwroot . '/grade/report/stats/index.php?id='.$courseid);
+}
+
+print_grade_page_head($courseid, 'settings', 'stats', get_string('preferences', 'gradereport_stats'));
+
+/// If USER has admin capability, print a link to the site config page for this report
+/// TODO: Add admin config page for this report
+if (has_capability('moodle/site:config', $systemcontext)) {
+    echo '<div id="siteconfiglink"><a href="'.$CFG->wwwroot.'/'.$CFG->admin.'/settings.php?section=gradereportstats">';
+    echo get_string('changereportdefaults', 'grades');
+    echo "</a></div>\n";
+}
+
+print_simple_box_start("center");
+
+$mform->display();
+print_simple_box_end();
+
+print_footer($course);
+?>
diff --git a/grade/report/stats/preferences_form.php b/grade/report/stats/preferences_form.php
new file mode 100755
index 0000000000..eff26cba56
--- /dev/null
+++ b/grade/report/stats/preferences_form.php
@@ -0,0 +1,181 @@
+<?php
+///////////////////////////////////////////////////////////////////////////
+//                                                                       //
+// NOTICE OF COPYRIGHT                                                   //
+//                                                                       //
+// Moodle - Modular Object-Oriented Dynamic Learning Environment         //
+//          http://moodle.org                                            //
+//                                                                       //
+// Copyright (C) 1999 onwards  Martin Dougiamas  http://moodle.com       //
+//                                                                       //
+// This program is free software; you can redistribute it and/or modify  //
+// it under the terms of the GNU General Public License as published by  //
+// the Free Software Foundation; either version 2 of the License, or     //
+// (at your option) any later version.                                   //
+//                                                                       //
+// This program is distributed in the hope that it will be useful,       //
+// but WITHOUT ANY WARRANTY; without even the implied warranty of        //
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         //
+// GNU General Public License for more details:                          //
+//                                                                       //
+//          http://www.gnu.org/copyleft/gpl.html                         //
+//                                                                       //
+///////////////////////////////////////////////////////////////////////////
+
+/**
+ * FIle with class defition for stats_report_preferences_form.
+ * Used by preferences.php
+ * @package gradebook
+ */
+
+require_once($CFG->libdir.'/formslib.php');
+require_once($CFG->dirroot . '/grade/report/stats/lib.php');
+
+/**
+ * Moodle form to be used to set user preferences for report/stats
+ * gradebook plugin.
+ * @uses moodleform
+ */
+class stats_report_preferences_form extends moodleform {
+
+    /**
+     * Fourm definition.
+     */
+    public function definition() {
+        global $USER, $CFG;
+
+        $stats = grade_report_stats::get_stats();
+
+        $mform    =& $this->_form;
+        $course   = $this->_customdata['course'];
+
+        $context = get_context_instance(CONTEXT_COURSE, $course->id);
+        $systemcontext = get_context_instance(CONTEXT_SYSTEM);
+        $stryes                 = get_string('yes');
+        $strno                  = get_string('no');
+
+        $checkbox_default = array(GRADE_REPORT_PREFERENCE_DEFAULT => '*default*', 0 => $strno, 1 => $stryes);
+
+        $advanced = array();
+        $preferences = array();
+
+        $preferences['prefgeneral'] = array(
+                          /*  'aggregationview'     => array(GRADE_REPORT_PREFERENCE_DEFAULT => '*default*',
+                                                         GRADE_REPORT_AGGREGATION_VIEW_FULL => get_string('fullmode', 'grades'),
+                                                         GRADE_REPORT_AGGREGATION_VIEW_AGGREGATES_ONLY => get_string('aggregatesonly', 'grades'),
+                                                         GRADE_REPORT_AGGREGATION_VIEW_GRADES_ONLY => get_string('gradesonly', 'grades')
+                            ),*/
+
+                            'aggregationposition' => array(GRADE_REPORT_PREFERENCE_DEFAULT => '*default*',
+                                                                       GRADE_REPORT_AGGREGATION_POSITION_FIRST => get_string('positionfirst', 'grades'),
+                                                                       GRADE_REPORT_AGGREGATION_POSITION_LAST => get_string('positionlast', 'grades')
+                            )
+        );
+        $preferences['prefstats'] = array();
+        $preferences['prefshow'] = array();
+
+        foreach($stats as $key=>$stat) {
+            $preferences['prefstats'][$key] = $checkbox_default;
+        }
+
+        $preferences['prefshow']['showgroups'] = $checkbox_default;
+        $preferences['prefshow']['showranges'] = $checkbox_default;
+        $preferences['prefshow']['shownumgrades'] = $checkbox_default;
+        $preferences['prefshow']['showscaleitems'] = $checkbox_default;
+        $preferences['prefshow']['showvalueitems'] = $checkbox_default;
+        $preferences['prefshow']['showinverted'] = $checkbox_default;
+
+        $preferences['prefcalc']['incompleasmin']  = $checkbox_default;
+        $preferences['prefcalc']['usehidden']  = $checkbox_default;
+        $preferences['prefcalc']['uselocked']  = $checkbox_default;
+
+        foreach ($preferences as $group => $prefs) {
+            $mform->addElement('header', $group, get_string($group, 'gradereport_stats'));
+
+            foreach ($prefs as $pref => $type) {
+                $full_pref  = 'grade_report_stats' . $pref;
+                $pref_value = get_user_preferences($full_pref);
+	            $course_value = null;
+                //$options = $type;
+                //$type = 'select';
+
+                if (!empty($CFG->{$full_pref})) {
+                    $course_value = grade_get_setting($course->id, $pref, $CFG->{$full_pref});
+                }
+
+                $options = null;
+                if (is_array($type)) {
+                    $options = $type;
+                    $type = 'select';
+                    // MDL-11478
+                    // get default aggregationposition from grade_settings
+                    if (!empty($CFG->{$full_pref})) {
+                        $course_value = grade_get_setting($course->id, $pref, $CFG->{$full_pref});
+                    }
+
+                    if ($pref == 'aggregationposition') {
+                        if (!empty($options[$course_value])) {
+                            $default = $options[$course_value];
+                        } else {
+                            $default = $options[$CFG->grade_aggregationposition];
+                        }
+                    } elseif (isset($options[$CFG->{$full_pref}])) {
+                        $default = $options[$CFG->{$full_pref}];
+                    } else {
+                        $default = '';
+                    }
+                } else {
+                    $default = $CFG->$full_pref;
+                }
+                /*
+                if ($pref == 'aggregationposition') {
+                    if (!empty($options[$course_value])) {
+                        $default = $options[$course_value];
+                    } elseif(isset($CFG->grade_aggregationposition)) {
+                        $default = $options[$CFG->grade_aggregationposition];
+                    }
+                } elseif ($pref == 'aggregationview' && isset($CFG->grade_report_aggregationview) && isset($options[$CFG->grade_report_aggregationview])) {
+                    $default = $options[$CFG->grade_report_aggregationview];
+                } else {
+                    if (!empty($options[$course_value])) {
+                        $default = $options[$course_value];
+                    } else {
+                        if ($pref == 'incompleasmin') {
+                            $default = $strno;
+                        } else {
+                            $default = $stryes;
+                        }
+                    }
+                }*/
+
+                $help_string = get_string("config$pref", 'gradereport_stats');
+
+                // Replace the '*default*' value with the site default language string - 'default' might collide with custom language packs
+                if (!is_null($options) AND isset($options[GRADE_REPORT_PREFERENCE_DEFAULT]) && $options[GRADE_REPORT_PREFERENCE_DEFAULT] == '*default*') {
+                    $options[GRADE_REPORT_PREFERENCE_DEFAULT] = get_string('reportdefault', 'grades', $default);
+                } elseif ($type == 'text') {
+                    $help_string = get_string("config{$pref}default", 'gradereport_stats', $default);
+                }
+
+                if($group == 'prefstats') {
+                    $label = get_string('statsshow', 'gradereport_stats') . ' ' . $stats[$pref]->name;
+                } else {
+                    $label = get_string($pref, 'gradereport_stats');
+                }
+
+                $mform->addElement($type, $full_pref, $label, $options);
+                $mform->setHelpButton($full_pref, array('stats' . $pref, get_string($pref, 'gradereport_stats'), 'grade'), true);
+                $mform->setDefault($full_pref, $pref_value);
+                $mform->setType($full_pref, PARAM_ALPHANUM);
+            }
+        }
+
+        $mform->addElement('hidden', 'id');
+        $mform->setType('id', PARAM_INT);
+        $mform->setDefault('id', $course->id);
+
+        $this->add_action_buttons();
+    }
+}
+
+?>
diff --git a/grade/report/stats/print.php b/grade/report/stats/print.php
new file mode 100644
index 0000000000..de9033a657
--- /dev/null
+++ b/grade/report/stats/print.php
@@ -0,0 +1,80 @@
+<?php
+///////////////////////////////////////////////////////////////////////////
+//                                                                       //
+// NOTICE OF COPYRIGHT                                                   //
+//                                                                       //
+// Moodle - Modular Object-Oriented Dynamic Learning Environment         //
+//          http://moodle.org                                            //
+//                                                                       //
+// Copyright (C) 1999 onwards  Martin Dougiamas  http://moodle.com       //
+//                                                                       //
+// This program is free software; you can redistribute it and/or modify  //
+// it under the terms of the GNU General Public License as published by  //
+// the Free Software Foundation; either version 2 of the License, or     //
+// (at your option) any later version.                                   //
+//                                                                       //
+// This program is distributed in the hope that it will be useful,       //
+// but WITHOUT ANY WARRANTY; without even the implied warranty of        //
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         //
+// GNU General Public License for more details:                          //
+//                                                                       //
+//          http://www.gnu.org/copyleft/gpl.html                         //
+//                                                                       //
+///////////////////////////////////////////////////////////////////////////
+
+/**
+ * Printer page for the stats report plugin.
+ * @package gradebook
+ */
+
+require_once '../../../config.php';
+require_once $CFG->libdir.'/gradelib.php';
+require_once $CFG->dirroot.'/grade/lib.php';
+require_once $CFG->dirroot.'/grade/report/stats/lib.php';
+
+$courseid = required_param('id');
+
+$reportname = get_string('modulename', 'gradereport_stats');
+
+/// basic access checks
+if(isset($DB) && !is_null($DB)) {
+    $course = $DB->get_record('course', array('id' => $courseid));
+} else {
+    $course = get_record('course', 'id', $courseid);
+}
+if (!$course) {
+        print_error('nocourseid');
+}
+require_login($course);
+$context = get_context_instance(CONTEXT_COURSE, $course->id);
+require_capability('gradereport/stats:view', $context);
+
+/// get tracking object
+$gpr = new grade_plugin_return(array('type'=>'report', 'plugin'=>'stats', 'courseid'=>$courseid));
+
+/// last selected report session tracking
+if (!isset($USER->grade_last_report)) {
+    $USER->grade_last_report = array();
+}
+$USER->grade_last_report[$course->id] = 'stats';
+
+grade_regrade_final_grades($courseid);
+
+/// Get report object
+$report = new grade_report_stats($courseid, $gpr, $context);
+
+
+/// Build report to output
+$report->load_users();
+$report->harvest_data();
+$report->report_data();
+$report->adapt_data(true);
+
+/// Print report
+echo '<html><title>' . $reportname . ' for '  . $course->shortname .  '</title><body>';
+echo '<div style="font-size:25px; text-align:center; font-weight:bold">' . $course->fullname . ': ' . $reportname. '</div>';
+echo '<div style="text-align:center;">' . userdate(time()) . '</div>';
+echo '<br/><br/>';
+echo $report->html;
+echo '</body></html>';
+?>
\ No newline at end of file
diff --git a/grade/report/stats/settings.php b/grade/report/stats/settings.php
new file mode 100644
index 0000000000..8037e7deba
--- /dev/null
+++ b/grade/report/stats/settings.php
@@ -0,0 +1,101 @@
+<?php // $Id$
+
+///////////////////////////////////////////////////////////////////////////
+//                                                                       //
+// NOTICE OF COPYRIGHT                                                   //
+//                                                                       //
+// Moodle - Modular Object-Oriented Dynamic Learning Environment         //
+//          http://moodle.com                                            //
+//                                                                       //
+// Copyright (C) 1999 onwards Martin Dougiamas  http://dougiamas.com     //
+//                                                                       //
+// This program is free software; you can redistribute it and/or modify  //
+// it under the terms of the GNU General Public License as published by  //
+// the Free Software Foundation; either version 2 of the License, or     //
+// (at your option) any later version.                                   //
+//                                                                       //
+// This program is distributed in the hope that it will be useful,       //
+// but WITHOUT ANY WARRANTY; without even the implied warranty of        //
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         //
+// GNU General Public License for more details:                          //
+//                                                                       //
+//          http://www.gnu.org/copyleft/gpl.html                         //
+//                                                                       //
+///////////////////////////////////////////////////////////////////////////
+
+
+$strshow = get_string('statsshow', 'gradereport_stats') . ' ';
+
+/// Add settings for this module to the $settings object (it's already defined)
+$settings->add(new admin_setting_configselect('grade_report_stats_aggregationposition', 
+    get_string('aggregationposition', 'grades'), 
+    get_string('configaggregationposition', 'grades'), 
+    GRADE_REPORT_AGGREGATION_POSITION_LAST, 
+    array(GRADE_REPORT_AGGREGATION_POSITION_FIRST => get_string('positionfirst', 'grades'),
+          GRADE_REPORT_AGGREGATION_POSITION_LAST => get_string('positionlast', 'grades'))));
+
+$settings->add(new admin_setting_configcheckbox('grade_report_statshighest', 
+    $strshow . get_string('highest', 'gradereport_stats'),
+    get_string('stats:stat:highest', 'gradereport_stats'), 1));
+
+$settings->add(new admin_setting_configcheckbox('grade_report_statslowest', 
+    $strshow . get_string('lowest', 'gradereport_stats'),
+    get_string('stats:stat:lowest', 'gradereport_stats'), 1));
+
+$settings->add(new admin_setting_configcheckbox('grade_report_statsmean', 
+    $strshow . get_string('mean', 'gradereport_stats'),
+    get_string('stats:stat:mean', 'gradereport_stats'), 1));
+
+$settings->add(new admin_setting_configcheckbox('grade_report_statsmedian', 
+    $strshow . get_string('median', 'gradereport_stats'),
+    get_string('stats:stat:median', 'gradereport_stats'), 1));
+
+$settings->add(new admin_setting_configcheckbox('grade_report_statsmode', 
+    $strshow . get_string('mode', 'gradereport_stats'),
+    get_string('stats:stat:mode', 'gradereport_stats'), 1));
+
+$settings->add(new admin_setting_configcheckbox('grade_report_statspass_percent', 
+    $strshow . get_string('pass_percent', 'gradereport_stats'),
+    get_string('stats:stat:passpercent', 'gradereport_stats'), 1));
+
+$settings->add(new admin_setting_configcheckbox('grade_report_statsstandard_deviation', 
+    $strshow . get_string('standarddeviation', 'gradereport_stats'),
+    get_string('stats:stat:standarddeviation', 'gradereport_stats'), 1));
+
+$settings->add(new admin_setting_configcheckbox('grade_report_statsshowgroups', 
+    $strshow . get_string('showgroups', 'gradereport_stats'),
+    get_string('showgroups', 'gradereport_stats'), 1));
+
+$settings->add(new admin_setting_configcheckbox('grade_report_statsshowranges', 
+    $strshow . get_string('showranges', 'gradereport_stats'),
+    get_string('showranges', 'gradereport_stats'), 1));
+
+$settings->add(new admin_setting_configcheckbox('grade_report_statsshownumgrades', 
+    $strshow . get_string('shownumgrades', 'gradereport_stats'),
+    get_string('shownumgrades', 'gradereport_stats'), 1));
+
+$settings->add(new admin_setting_configcheckbox('grade_report_statsshowscaleitems', 
+    $strshow . get_string('showscaleitems', 'gradereport_stats'),
+    get_string('showscaleitems', 'gradereport_stats'), 1));
+
+$settings->add(new admin_setting_configcheckbox('grade_report_statsshowvalueitems', 
+    $strshow . get_string('showvalueitems', 'gradereport_stats'),
+    get_string('showvalueitems', 'gradereport_stats'), 1));
+
+$settings->add(new admin_setting_configcheckbox('grade_report_statsshowinverted', 
+    $strshow . get_string('showinverted', 'gradereport_stats'),
+    get_string('showinverted', 'gradereport_stats'), 1))
+;
+$settings->add(new admin_setting_configcheckbox('grade_report_statsincompleasmin', 
+    $strshow . get_string('incompleasmin', 'gradereport_stats'),
+    get_string('incompleasmin', 'gradereport_stats'), 0));
+
+$settings->add(new admin_setting_configcheckbox('grade_report_statsusehidden', 
+    $strshow . get_string('usehidden', 'gradereport_stats'),
+    get_string('usehidden', 'gradereport_stats'), 1));
+
+$settings->add(new admin_setting_configcheckbox('grade_report_statsuselocked', 
+    $strshow . get_string('uselocked', 'gradereport_stats'),
+    get_string('uselocked', 'gradereport_stats'), 1));
+
+?>
diff --git a/grade/report/stats/statistics/stat_highest.php b/grade/report/stats/statistics/stat_highest.php
new file mode 100755
index 0000000000..eb353aad50
--- /dev/null
+++ b/grade/report/stats/statistics/stat_highest.php
@@ -0,0 +1,41 @@
+<?php
+///////////////////////////////////////////////////////////////////////////
+//                                                                       //
+// NOTICE OF COPYRIGHT                                                   //
+//                                                                       //
+// Moodle - Modular Object-Oriented Dynamic Learning Environment         //
+//          http://moodle.org                                            //
+//                                                                       //
+// Copyright (C) 1999 onwards  Martin Dougiamas  http://moodle.com       //
+//                                                                       //
+// This program is free software; you can redistribute it and/or modify  //
+// it under the terms of the GNU General Public License as published by  //
+// the Free Software Foundation; either version 2 of the License, or     //
+// (at your option) any later version.                                   //
+//                                                                       //
+// This program is distributed in the hope that it will be useful,       //
+// but WITHOUT ANY WARRANTY; without even the implied warranty of        //
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         //
+// GNU General Public License for more details:                          //
+//                                                                       //
+//          http://www.gnu.org/copyleft/gpl.html                         //
+//                                                                       //
+///////////////////////////////////////////////////////////////////////////
+
+require_once($CFG->dirroot . '/grade/report/stats/statistics/stats.php');
+
+/**
+* Stats class for finding the highest grade for an item in a course.
+*/
+class highest extends stats {
+    public function __construct() {
+        parent::__construct(get_string('highest', 'gradereport_stats'));
+        $this->capability = 'gradereport/stats:stat:highest';
+    }
+
+    public function report_data($final_grades, $item=null){
+        return max($final_grades);
+    }
+}
+
+?>
\ No newline at end of file
diff --git a/grade/report/stats/statistics/stat_lowest.php b/grade/report/stats/statistics/stat_lowest.php
new file mode 100755
index 0000000000..44100e9abe
--- /dev/null
+++ b/grade/report/stats/statistics/stat_lowest.php
@@ -0,0 +1,41 @@
+<?php
+///////////////////////////////////////////////////////////////////////////
+//                                                                       //
+// NOTICE OF COPYRIGHT                                                   //
+//                                                                       //
+// Moodle - Modular Object-Oriented Dynamic Learning Environment         //
+//          http://moodle.org                                            //
+//                                                                       //
+// Copyright (C) 1999 onwards  Martin Dougiamas  http://moodle.com       //
+//                                                                       //
+// This program is free software; you can redistribute it and/or modify  //
+// it under the terms of the GNU General Public License as published by  //
+// the Free Software Foundation; either version 2 of the License, or     //
+// (at your option) any later version.                                   //
+//                                                                       //
+// This program is distributed in the hope that it will be useful,       //
+// but WITHOUT ANY WARRANTY; without even the implied warranty of        //
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         //
+// GNU General Public License for more details:                          //
+//                                                                       //
+//          http://www.gnu.org/copyleft/gpl.html                         //
+//                                                                       //
+///////////////////////////////////////////////////////////////////////////
+
+require_once($CFG->dirroot . '/grade/report/stats/statistics/stats.php');
+
+/**
+* Stats class for finding the lowest grade for an item in a course.
+*/
+class lowest extends stats {
+    public function __construct() {
+        parent::__construct(get_string('lowest', 'gradereport_stats'));
+        $this->capability = 'gradereport/stats:stat:lowest';
+    }
+
+    public function report_data($final_grades, $item=null){
+        return min($final_grades);
+    }
+}
+
+?>
\ No newline at end of file
diff --git a/grade/report/stats/statistics/stat_mean.php b/grade/report/stats/statistics/stat_mean.php
new file mode 100755
index 0000000000..1ad200f1d5
--- /dev/null
+++ b/grade/report/stats/statistics/stat_mean.php
@@ -0,0 +1,41 @@
+<?php
+///////////////////////////////////////////////////////////////////////////
+//                                                                       //
+// NOTICE OF COPYRIGHT                                                   //
+//                                                                       //
+// Moodle - Modular Object-Oriented Dynamic Learning Environment         //
+//          http://moodle.org                                            //
+//                                                                       //
+// Copyright (C) 1999 onwards  Martin Dougiamas  http://moodle.com       //
+//                                                                       //
+// This program is free software; you can redistribute it and/or modify  //
+// it under the terms of the GNU General Public License as published by  //
+// the Free Software Foundation; either version 2 of the License, or     //
+// (at your option) any later version.                                   //
+//                                                                       //
+// This program is distributed in the hope that it will be useful,       //
+// but WITHOUT ANY WARRANTY; without even the implied warranty of        //
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         //
+// GNU General Public License for more details:                          //
+//                                                                       //
+//          http://www.gnu.org/copyleft/gpl.html                         //
+//                                                                       //
+///////////////////////////////////////////////////////////////////////////
+
+require_once($CFG->dirroot . '/grade/report/stats/statistics/stats.php');
+
+/**
+ * Stats class for finding the mean of the set of grades for an item in a course.
+ */
+class mean extends stats {
+    public function __construct() {
+        parent::__construct(get_string('mean', 'gradereport_stats'));
+        $this->capability = 'gradereport/stats:stat:mean';
+    }
+
+    public function report_data($final_grades, $item=null){
+        return (array_sum($final_grades) / count($final_grades));
+    }
+}
+
+?>
\ No newline at end of file
diff --git a/grade/report/stats/statistics/stat_median.php b/grade/report/stats/statistics/stat_median.php
new file mode 100755
index 0000000000..1b15862ef0
--- /dev/null
+++ b/grade/report/stats/statistics/stat_median.php
@@ -0,0 +1,42 @@
+<?php
+///////////////////////////////////////////////////////////////////////////
+//                                                                       //
+// NOTICE OF COPYRIGHT                                                   //
+//                                                                       //
+// Moodle - Modular Object-Oriented Dynamic Learning Environment         //
+//          http://moodle.org                                            //
+//                                                                       //
+// Copyright (C) 1999 onwards  Martin Dougiamas  http://moodle.com       //
+//                                                                       //
+// This program is free software; you can redistribute it and/or modify  //
+// it under the terms of the GNU General Public License as published by  //
+// the Free Software Foundation; either version 2 of the License, or     //
+// (at your option) any later version.                                   //
+//                                                                       //
+// This program is distributed in the hope that it will be useful,       //
+// but WITHOUT ANY WARRANTY; without even the implied warranty of        //
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         //
+// GNU General Public License for more details:                          //
+//                                                                       //
+//          http://www.gnu.org/copyleft/gpl.html                         //
+//                                                                       //
+///////////////////////////////////////////////////////////////////////////
+
+require_once($CFG->dirroot . '/grade/report/stats/statistics/stats.php');
+
+/**
+ * Stats class for finding the median of a set of grades for an item in a course.
+ */
+class median extends stats {
+    public function __construct() {
+        parent::__construct(get_string('median', 'gradereport_stats'));
+        $this->capability = 'gradereport/stats:stat:median';
+    }
+
+    public function report_data($final_grades, $item=null){
+        $midpoint = (count($final_grades) - 1) / 2;
+        return ($final_grades[floor($midpoint)] + $final_grades[ceil($midpoint)]) / 2;
+    }
+}
+
+?>
\ No newline at end of file
diff --git a/grade/report/stats/statistics/stat_mode.php b/grade/report/stats/statistics/stat_mode.php
new file mode 100755
index 0000000000..7bafd80359
--- /dev/null
+++ b/grade/report/stats/statistics/stat_mode.php
@@ -0,0 +1,64 @@
+ 
+<?php
+///////////////////////////////////////////////////////////////////////////
+//                                                                       //
+// NOTICE OF COPYRIGHT                                                   //
+//                                                                       //
+// Moodle - Modular Object-Oriented Dynamic Learning Environment         //
+//          http://moodle.org                                            //
+//                                                                       //
+// Copyright (C) 1999 onwards  Martin Dougiamas  http://moodle.com       //
+//                                                                       //
+// This program is free software; you can redistribute it and/or modify  //
+// it under the terms of the GNU General Public License as published by  //
+// the Free Software Foundation; either version 2 of the License, or     //
+// (at your option) any later version.                                   //
+//                                                                       //
+// This program is distributed in the hope that it will be useful,       //
+// but WITHOUT ANY WARRANTY; without even the implied warranty of        //
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         //
+// GNU General Public License for more details:                          //
+//                                                                       //
+//          http://www.gnu.org/copyleft/gpl.html                         //
+//                                                                       //
+///////////////////////////////////////////////////////////////////////////
+
+require_once($CFG->dirroot . '/grade/report/stats/statistics/stats.php');
+
+/**
+ * Stats class for finding the mode of a set of grades in an item in a course.
+ * NOTE: To pervent students from being able to find a list of all grades when
+ * there are no grades the same (or to many in the same) the mode will not be
+ * shown when there are over $maxmode number of modes.
+ */
+class mode extends stats {
+    public static $maxmode = 5;
+	
+	public function __construct() {
+        parent::__construct(get_string('mode', 'gradereport_stats'));
+		$this->capability = 'gradereport/stats:stat:mode';
+	}
+
+    public function report_data($final_grades, $item=null){
+        $occurrences = array();
+		$modes = array();
+	
+		foreach($final_grades as $grade) {
+			if(!array_key_exists(sprintf('%f', round($grade,2)), $occurrences)) {
+				$occurrences[sprintf('%f', round($grade,2))] = 1;
+			} else {
+				$occurrences[sprintf('%f', round($grade,2))]++;
+			}
+		}
+	
+		arsort($occurrences);
+		$modes = array_keys($occurrences, current($occurrences));
+	
+		if(count($modes) <= mode::$maxmode) {
+			return $modes;
+		} else {
+			return null;
+		}
+    }
+}
+?>
\ No newline at end of file
diff --git a/grade/report/stats/statistics/stat_pass_percent.php b/grade/report/stats/statistics/stat_pass_percent.php
new file mode 100755
index 0000000000..023a32a2fc
--- /dev/null
+++ b/grade/report/stats/statistics/stat_pass_percent.php
@@ -0,0 +1,52 @@
+ <?php
+///////////////////////////////////////////////////////////////////////////
+//                                                                       //
+// NOTICE OF COPYRIGHT                                                   //
+//                                                                       //
+// Moodle - Modular Object-Oriented Dynamic Learning Environment         //
+//          http://moodle.org                                            //
+//                                                                       //
+// Copyright (C) 1999 onwards  Martin Dougiamas  http://moodle.com       //
+//                                                                       //
+// This program is free software; you can redistribute it and/or modify  //
+// it under the terms of the GNU General Public License as published by  //
+// the Free Software Foundation; either version 2 of the License, or     //
+// (at your option) any later version.                                   //
+//                                                                       //
+// This program is distributed in the hope that it will be useful,       //
+// but WITHOUT ANY WARRANTY; without even the implied warranty of        //
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         //
+// GNU General Public License for more details:                          //
+//                                                                       //
+//          http://www.gnu.org/copyleft/gpl.html                         //
+//                                                                       //
+///////////////////////////////////////////////////////////////////////////
+
+require_once($CFG->dirroot . '/grade/report/stats/statistics/stats.php');
+require_once($CFG->dirroot . '/lib/grade/grade_grade.php');
+
+/**
+ * Stats class for finding the percent of grades above the set
+ * gradepass for the item in a course.
+ * NOTE: This statistic depends on gradepass being set for an item,
+ * by defualt it is set to 0, witch is also noramly what the mingrade is
+ * so it will show the pass percent as 100% if everything is left as default.
+ */
+class pass_percent extends stats {
+    public function __construct() {
+        parent::__construct(get_string('pass_percent', 'gradereport_stats'), GRADE_DISPLAY_TYPE_PERCENTAGE);
+		$this->capability = 'gradereport/stats:stat:passpercent';
+	}
+
+    public function report_data($final_grades, $item=null){
+		$numpass = 0;
+		foreach($final_grades as $grade) {
+			if($grade >= $item->gradepass) {
+				$numpass++;
+			}
+		}
+	
+		return grade_grade::standardise_score($numpass / count($final_grades),  0, 1, $item->grademin, $item->grademax);
+    }
+}
+?>
\ No newline at end of file
diff --git a/grade/report/stats/statistics/stat_standard_deviation.php b/grade/report/stats/statistics/stat_standard_deviation.php
new file mode 100755
index 0000000000..c52955dda3
--- /dev/null
+++ b/grade/report/stats/statistics/stat_standard_deviation.php
@@ -0,0 +1,49 @@
+<?php
+///////////////////////////////////////////////////////////////////////////
+//                                                                       //
+// NOTICE OF COPYRIGHT                                                   //
+//                                                                       //
+// Moodle - Modular Object-Oriented Dynamic Learning Environment         //
+//          http://moodle.org                                            //
+//                                                                       //
+// Copyright (C) 1999 onwards  Martin Dougiamas  http://moodle.com       //
+//                                                                       //
+// This program is free software; you can redistribute it and/or modify  //
+// it under the terms of the GNU General Public License as published by  //
+// the Free Software Foundation; either version 2 of the License, or     //
+// (at your option) any later version.                                   //
+//                                                                       //
+// This program is distributed in the hope that it will be useful,       //
+// but WITHOUT ANY WARRANTY; without even the implied warranty of        //
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         //
+// GNU General Public License for more details:                          //
+//                                                                       //
+//          http://www.gnu.org/copyleft/gpl.html                         //
+//                                                                       //
+///////////////////////////////////////////////////////////////////////////
+
+require_once($CFG->dirroot . '/grade/report/stats/statistics/stats.php');
+
+/**
+ * Stats class for finding the standard deviation of the grades for an item in a course.
+ */
+class standard_deviation extends stats {
+    public function __construct() {
+        parent::__construct(get_string('standarddeviation', 'gradereport_stats'));
+		$this->capability = 'gradereport/stats:stat:standarddeviation';
+	}
+
+    public function report_data($final_grades, $item=null){
+		$sum = 0;
+		$n = count($final_grades);
+		$avg = array_sum($final_grades) / $n;
+	
+		foreach($final_grades as $grade) {
+			$sum += pow($grade - $avg, 2);
+		}
+	    
+		return sqrt($sum / $n);
+    }
+}
+
+?>
\ No newline at end of file
diff --git a/grade/report/stats/statistics/stats.php b/grade/report/stats/statistics/stats.php
new file mode 100755
index 0000000000..afa941b802
--- /dev/null
+++ b/grade/report/stats/statistics/stats.php
@@ -0,0 +1,82 @@
+<?php
+///////////////////////////////////////////////////////////////////////////
+//                                                                       //
+// NOTICE OF COPYRIGHT                                                   //
+//                                                                       //
+// Moodle - Modular Object-Oriented Dynamic Learning Environment         //
+//          http://moodle.org                                            //
+//                                                                       //
+// Copyright (C) 1999 onwards  Martin Dougiamas  http://moodle.com       //
+//                                                                       //
+// This program is free software; you can redistribute it and/or modify  //
+// it under the terms of the GNU General Public License as published by  //
+// the Free Software Foundation; either version 2 of the License, or     //
+// (at your option) any later version.                                   //
+//                                                                       //
+// This program is distributed in the hope that it will be useful,       //
+// but WITHOUT ANY WARRANTY; without even the implied warranty of        //
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         //
+// GNU General Public License for more details:                          //
+//                                                                       //
+//          http://www.gnu.org/copyleft/gpl.html                         //
+//                                                                       //
+///////////////////////////////////////////////////////////////////////////
+
+/**
+ *File that defines the abstract stats class.
+ * @package gradebook
+ */
+ 
+ /**
+ * Abstract class stats to be extended by classes that will be
+ * defining new statistics for the report/stats plugin.
+ */
+abstract class stats {
+    /**
+     * The name of this statistic.
+     * @var string $name
+     */
+    public $name;
+    
+    /**
+     * The display type to use when outputing this result of this
+     * statistic. If null the defualt item display type will be used.
+     * @var int $displaytype
+     */
+    public $displaytype = null;
+    
+    /**
+     * The nummber of decimals to use when displaying the result
+     * of this statistic. If null the defualt item decimals are used.
+     */
+    public $decimals = null;
+    
+    public $capability = null;
+
+    /**
+     * Constructor for stats.
+     * @param string $name name of the statistic.
+     * @param int $displaytype
+     * @param int $decimals
+     */
+    public function __construct($name = null, $displaytype = null, $decimals=null) {
+        $this->name = $name;        
+        $this->displaytype = $displaytype;
+        $this->decimals = $decimals;
+
+        if($name == null) {
+            $this->name = get_string('statistic', 'gradereport_stats');
+        }
+    }
+
+    /**
+     * Abstract method that is called to make the statistic and
+     * do all the processing for it.
+     * @param array $final_grades ordered array of final grades.
+     * @iparam object $item the gradeable item for witch the grades are a part of.
+     * @returns an array or floating point value of the statistic.
+     */
+    abstract public function report_data($final_grades, $item=null);
+}
+
+?>
\ No newline at end of file
diff --git a/grade/report/stats/styles.php b/grade/report/stats/styles.php
new file mode 100755
index 0000000000..5c79006928
--- /dev/null
+++ b/grade/report/stats/styles.php
@@ -0,0 +1,254 @@
+.flexible th {
+    white-space:nowrap;
+}
+
+.gradestable th.user img {
+    width: 20px;
+}
+
+.gradestable th.user, .gradestable th.range {
+    white-space: nowrap;
+}
+
+.grade-report-stats table .catlevel1 {
+  background-color: #ffffff;
+}
+.grade-report-stats table .catlevel2 {
+  background-color: #eeeeee;
+}
+.grade-report-stats table .catlevel3 {
+  background-color: #dddddd;
+}
+
+.grade-report-stats table td.overridden {
+  background-color: #EFD9B3;
+}
+
+.grade-report-stats table tr.avg td.cell {
+    background-color: #efefff;
+}
+
+.grade-report-stats table tr.odd td.cell {
+    background-color: #efefef;
+}
+
+.grade-report-stats table tr.even td.overridden {
+  background-color: #F3E4C0; 
+}
+
+.grade-report-stats table tr.odd td.overridden {
+  background-color: #EFD9A4;
+}
+
+.grade-report-stats table tr.even td.excluded {
+  background-color: #EABFFF; 
+}
+
+.grade-report-stats table tr.odd td.excluded {
+  background-color: #E5AFFF;
+}
+
+.grade-report-stats table th th.heading th.heading.c0 th.header th.header.c0 {
+    border-width:1px;
+}
+
+.grade-report-stats table tr.odd th.header { 
+    
+    border-width:1px;
+}
+
+.grade-report-stats table td.vmarked, .grade-report-stats table tr.odd td.vmarked {
+    background-color: #ffcc33;
+}
+
+.grade-report-stats table td.hmarked, .grade-report-stats table tr.odd td.hmarked {
+    background-color: #ffff99;
+}
+
+.grade-report-stats table td.hmarked.vmarked, .grade-report-stats table tr.odd td.hmarked.vmarked{
+    background-color: #ffcc99;
+} 
+
+.grade-report-stats table tr.groupavg td.cell {
+    background-color: #efffef;
+}
+
+.grade-report-stats table tr.groupavg td.cell {
+  font-weight: bold;
+  color: #006400;
+}
+
+.grade-report-stats table tr.avg td.cell {
+  font-weight: bold;
+  color: #00008B;
+}
+
+.grade-report-stats table td.cat,
+.grade-report-stats table td.course {
+  font-weight: bold;
+}
+
+.grade-report-stats table {
+    font-size: 80%;
+    white-space: nowrap;
+    border-color: #D3D3D3;
+}
+
+.grade-report-stats table {
+  border-width:1px;
+  border-style:solid;
+  margin-top: 20px;
+  border-color: #D3D3D3;
+}
+
+.grade-report-stats #overDiv table {
+  margin: 0;  
+}
+
+.grade-report-stats #overDiv table td.feedback {
+  border: 0px;
+}
+.grade-report-stats #overDiv .feedback {
+  background-color: #AABBFF;
+  color: #000000;
+  font-family: Verdana;
+  font-size: 70%;
+  font-weight: normal;  
+}
+
+.grade-report-stats #overDiv .caption {
+  background-color: #5566CC;
+  color: #CCCCFF;
+  font-family: Arial;
+  font-size: 70%;
+  font-weight: bold;
+}
+
+.grade-report-stats div.submit {
+  margin-top: 20px;
+  text-align: center;
+}
+
+.grade-report-stats table td {
+  border-width:1px;
+  border-style:solid;
+  border-color: #D3D3D3;
+}
+
+.grade-report-stats table tr.heading {
+  border-width:0px 0px 0px 0px;
+  border-style:solid;
+  border-color: #D3D3D3;
+}
+
+.grade-report-stats table .heading td {
+  border-width:0px 0px 0px 0px;
+  border-style:solid;
+  border-color: #D3D3D3;
+}
+
+.grade-report-stats table th.category {
+  border-width:1px 1px 1px 1px;
+  border-style:solid;
+  border-color: #D3D3D3;
+  vertical-align: top;
+}
+
+.grade-report-stats table th.user {
+  border-width:0px 0px 1px 0px;
+  border-style:solid;
+  border-color: #D3D3D3;
+}
+
+.grade-report-stats table th.useridnumber {
+  border-width:0px 0px 1px 1px;
+  border-style:solid;
+  border-color: #D3D3D3;
+}
+
+.grade-report-stats table th.categoryitem,
+.grade-report-stats table th.courseitem,
+.grade-report-stats table td.topleft {
+  border-width:0px 1px 0px 1px;
+  border-style:solid;
+  vertical-align: top;
+  border-color: #D3D3D3;
+}
+
+.grade-report-stats table#participants th {
+  vertical-align: top; 
+}
+
+.grade-report-stats table td.fillerfirst {
+  border-width:0px 0px 0px 1px;
+  border-style:solid;
+  border-color: #D3D3D3;
+}
+
+.grade-report-stats table td.fillerlast {
+  border-width:0px 1px 0px 0px;
+  border-style:solid;
+  border-color: #D3D3D3;
+}
+
+.grade-report-stats table th.item {
+  border-width:1px 1px 1px 1px;
+  border-style:solid;
+  border-color: #D3D3D3;
+  vertical-align: top;
+}
+
+.grade-report-stats div.gradertoggle {
+  display: inline;
+  margin-left: 20px;
+}
+
+.grade-report-stats table {
+  margin-left:auto;
+  margin-right:auto;
+}
+
+.grade-report-stats table  th.user {
+  text-align:left;
+}
+
+.grade-report-stats table  td.useridnumber {
+  text-align:left;
+}
+
+.grade-report-stats table  td {
+  text-align:right;
+}
+
+.grade-report-stats table th.range {
+  border-width:1px 1px 1px 1px;
+  border-style:solid;
+  border-color: #D3D3D3;
+}
+
+.grade-report-stats table .userpic {
+  display: inline;
+  margin-right: 10px;
+}
+
+.grade-report-stats table .quickfeedback {
+  border: #000000 1px dashed;
+}
+
+.grade-report-stats #siteconfiglink {
+  text-align: right;
+}
+
+.grade-report-stats table .hidden,
+.grade-report-stats table .hidden a {
+  color:#aaaaaa;
+}
+
+.grade-report-stats table .datesubmitted {
+  font-size: 0.7em;
+}
+
+.grade-report-stats table td.cell {
+  padding-left: 5px;
+  padding-right: 5px;
+}
diff --git a/grade/report/stats/tabs.php b/grade/report/stats/tabs.php
new file mode 100755
index 0000000000..abc8b665c9
--- /dev/null
+++ b/grade/report/stats/tabs.php
@@ -0,0 +1,49 @@
+<?php
+///////////////////////////////////////////////////////////////////////////
+//                                                                       //
+// NOTICE OF COPYRIGHT                                                   //
+//                                                                       //
+// Moodle - Modular Object-Oriented Dynamic Learning Environment         //
+//          http://moodle.org                                            //
+//                                                                       //
+// Copyright (C) 1999 onwards  Martin Dougiamas  http://moodle.com       //
+//                                                                       //
+// This program is free software; you can redistribute it and/or modify  //
+// it under the terms of the GNU General Public License as published by  //
+// the Free Software Foundation; either version 2 of the License, or     //
+// (at your option) any later version.                                   //
+//                                                                       //
+// This program is distributed in the hope that it will be useful,       //
+// but WITHOUT ANY WARRANTY; without even the implied warranty of        //
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         //
+// GNU General Public License for more details:                          //
+//                                                                       //
+//          http://www.gnu.org/copyleft/gpl.html                         //
+//                                                                       //
+///////////////////////////////////////////////////////////////////////////
+
+    /**
+     * Sets up the tabs for the report/stats plug-in and displays them.
+     * @package gradebook
+     */
+
+    $row = $tabs = array();
+    $tabcontext = get_context_instance(CONTEXT_COURSE, $COURSE->id);
+    $row[] = new tabobject('statsreport',
+                           $CFG->wwwroot.'/grade/report/stats/index.php?id='.$courseid,
+                           get_string('modulename', 'gradereport_stats'));
+    
+    $row[] = new tabobject('preferences',
+                           $CFG->wwwroot.'/grade/report/stats/preferences.php?id='.$courseid,
+                           get_string('myreportpreferences', 'grades'));
+    
+    /// A bit of a hack to make the printable tab open a new window.
+    $row[] = new tabobject('printable',
+                           '#" onClick="javascript:window.open(\'' . $CFG->wwwroot. '/grade/report/stats/print.php?id=' . $courseid . '\')',
+                           get_string('printable', 'gradereport_stats'));
+
+    $tabs[] = $row;
+    echo '<div class="gradedisplay">';
+    print_tabs($tabs, $currenttab);
+    echo '</div>';
+?>
\ No newline at end of file
diff --git a/grade/report/stats/version.php b/grade/report/stats/version.php
new file mode 100755
index 0000000000..6aa9c25528
--- /dev/null
+++ b/grade/report/stats/version.php
@@ -0,0 +1,28 @@
+<?PHP 
+///////////////////////////////////////////////////////////////////////////
+//                                                                       //
+// NOTICE OF COPYRIGHT                                                   //
+//                                                                       //
+// Moodle - Modular Object-Oriented Dynamic Learning Environment         //
+//          http://moodle.org                                            //
+//                                                                       //
+// Copyright (C) 1999 onwards  Martin Dougiamas  http://moodle.com       //
+//                                                                       //
+// This program is free software; you can redistribute it and/or modify  //
+// it under the terms of the GNU General Public License as published by  //
+// the Free Software Foundation; either version 2 of the License, or     //
+// (at your option) any later version.                                   //
+//                                                                       //
+// This program is distributed in the hope that it will be useful,       //
+// but WITHOUT ANY WARRANTY; without even the implied warranty of        //
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         //
+// GNU General Public License for more details:                          //
+//                                                                       //
+//          http://www.gnu.org/copyleft/gpl.html                         //
+//                                                                       //
+///////////////////////////////////////////////////////////////////////////
+
+$plugin->version  = 2008061400;
+$plugin->requires = 2007101000;
+
+?>