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| <?php | ||
| // This file is part of Moodle - http://moodle.org/ | ||
| // | ||
| // Moodle 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 3 of the License, or | ||
| // (at your option) any later version. | ||
| // | ||
| // Moodle 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. | ||
| // | ||
| // You should have received a copy of the GNU General Public License | ||
| // along with Moodle. If not, see <http://www.gnu.org/licenses/>. | ||
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| /** | ||
| * The statistics calculator returns an instance of this class which contains the calculated statistics. | ||
| * | ||
| * These quiz statistics calculations are described here : | ||
| * | ||
| * http://docs.moodle.org/dev/Quiz_statistics_calculations#Test_statistics | ||
| * | ||
| * @package quiz_statistics | ||
| * @copyright 2013 The Open University | ||
| * @author James Pratt [email protected] | ||
| * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later | ||
| */ | ||
| class quiz_statistics_calculated { | ||
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| public function __construct($allattempts = null) { | ||
| if ($allattempts !== null) { | ||
| $this->allattempts = $allattempts; | ||
| } | ||
| } | ||
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| /** | ||
| * @var bool whether we are calculating calculate stats from all attempts. | ||
| */ | ||
| public $allattempts; | ||
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| /* Following stats all described here : http://docs.moodle.org/dev/Quiz_statistics_calculations#Test_statistics */ | ||
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| public $firstattemptscount = 0; | ||
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| public $allattemptscount = 0; | ||
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| public $firstattemptsavg; | ||
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| public $allattemptsavg; | ||
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| public $median; | ||
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| public $standarddeviation; | ||
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| public $skewness; | ||
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| public $kurtosis; | ||
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| public $cic; | ||
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| public $errorratio; | ||
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| public $standarderror; | ||
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| /** | ||
| * @var int time these stats where calculated and cached. | ||
| */ | ||
| public $timemodified; | ||
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| public function s() { | ||
| if ($this->allattempts) { | ||
| return $this->allattemptscount; | ||
| } else { | ||
| return $this->firstattemptscount; | ||
| } | ||
| } | ||
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| public function avg() { | ||
| if ($this->allattempts) { | ||
| return $this->allattemptsavg; | ||
| } else { | ||
| return $this->firstattemptsavg; | ||
| } | ||
| } | ||
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| /** | ||
| * @param $course | ||
| * @param $cm | ||
| * @param $quiz | ||
| * @return array to display in table or spreadsheet. | ||
| */ | ||
| public function get_formatted_quiz_info_data($course, $cm, $quiz) { | ||
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| // You can edit this array to control which statistics are displayed. | ||
| $todisplay = array('firstattemptscount' => 'number', | ||
| 'allattemptscount' => 'number', | ||
| 'firstattemptsavg' => 'summarks_as_percentage', | ||
| 'allattemptsavg' => 'summarks_as_percentage', | ||
| 'median' => 'summarks_as_percentage', | ||
| 'standarddeviation' => 'summarks_as_percentage', | ||
| 'skewness' => 'number_format', | ||
| 'kurtosis' => 'number_format', | ||
| 'cic' => 'number_format_percent', | ||
| 'errorratio' => 'number_format_percent', | ||
| 'standarderror' => 'summarks_as_percentage'); | ||
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| // General information about the quiz. | ||
| $quizinfo = array(); | ||
| $quizinfo[get_string('quizname', 'quiz_statistics')] = format_string($quiz->name); | ||
| $quizinfo[get_string('coursename', 'quiz_statistics')] = format_string($course->fullname); | ||
| if ($cm->idnumber) { | ||
| $quizinfo[get_string('idnumbermod')] = $cm->idnumber; | ||
| } | ||
| if ($quiz->timeopen) { | ||
| $quizinfo[get_string('quizopen', 'quiz')] = userdate($quiz->timeopen); | ||
| } | ||
| if ($quiz->timeclose) { | ||
| $quizinfo[get_string('quizclose', 'quiz')] = userdate($quiz->timeclose); | ||
| } | ||
| if ($quiz->timeopen && $quiz->timeclose) { | ||
| $quizinfo[get_string('duration', 'quiz_statistics')] = | ||
| format_time($quiz->timeclose - $quiz->timeopen); | ||
| } | ||
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| // The statistics. | ||
| foreach ($todisplay as $property => $format) { | ||
| if (!isset($this->$property) || !$format) { | ||
| continue; | ||
| } | ||
| $value = $this->$property; | ||
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| switch ($format) { | ||
| case 'summarks_as_percentage': | ||
| $formattedvalue = quiz_report_scale_summarks_as_percentage($value, $quiz); | ||
| break; | ||
| case 'number_format_percent': | ||
| $formattedvalue = quiz_format_grade($quiz, $value) . '%'; | ||
| break; | ||
| case 'number_format': | ||
| // 2 extra decimal places, since not a percentage, | ||
| // and we want the same number of sig figs. | ||
| $formattedvalue = format_float($value, $quiz->decimalpoints + 2); | ||
| break; | ||
| case 'number': | ||
| $formattedvalue = $value + 0; | ||
| break; | ||
| default: | ||
| $formattedvalue = $value; | ||
| } | ||
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| $quizinfo[get_string($property, 'quiz_statistics', $this->using_attempts_string())] = $formattedvalue; | ||
| } | ||
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| return $quizinfo; | ||
| } | ||
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| /** | ||
| * @return string the appropriate lang string to describe this option. | ||
| */ | ||
| protected function using_attempts_string() { | ||
| if ($this->allattempts) { | ||
| return get_string('allattempts', 'quiz_statistics'); | ||
| } else { | ||
| return get_string('firstattempts', 'quiz_statistics'); | ||
| } | ||
| } | ||
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| /** | ||
| * @var array of names of properties of this class that are cached in db record. | ||
| */ | ||
| protected $fieldsindb = array('allattempts', 'firstattemptscount', 'allattemptscount', 'firstattemptsavg', 'allattemptsavg', | ||
| 'median', 'standarddeviation', 'skewness', | ||
| 'kurtosis', 'cic', 'errorratio', 'standarderror'); | ||
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| /** | ||
| * Cache the stats contained in this class. | ||
| * | ||
| * @param $qubaids qubaid_condition | ||
| */ | ||
| public function cache($qubaids) { | ||
| global $DB; | ||
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| $toinsert = new stdClass(); | ||
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| foreach ($this->fieldsindb as $field) { | ||
| $toinsert->{$field} = $this->{$field}; | ||
| } | ||
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| $toinsert->hashcode = $qubaids->get_hash_code(); | ||
| $toinsert->timemodified = time(); | ||
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| // Fix up some dodgy data. | ||
| if (isset($toinsert->errorratio) && is_nan($toinsert->errorratio)) { | ||
| $toinsert->errorratio = null; | ||
| } | ||
| if (isset($toinsert->standarderror) && is_nan($toinsert->standarderror)) { | ||
| $toinsert->standarderror = null; | ||
| } | ||
|
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| // Store the data. | ||
| $DB->insert_record('quiz_statistics', $toinsert); | ||
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| } | ||
|
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| /** | ||
| * Given a record from 'quiz_statistics' table load the data into the properties of this class. | ||
| * | ||
| * @param $record from db. | ||
| */ | ||
| public function populate_from_record($record) { | ||
| foreach ($this->fieldsindb as $field) { | ||
| $this->$field = $record->$field; | ||
| } | ||
| $this->timemodified = $record->timemodified; | ||
| } | ||
| } |
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