MDL-41756 (2) quiz statistics : break down question stats by variant
[moodle.git] / mod / quiz / report / statistics / tests / stats_from_steps_walkthrough_test.php
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1<?php
2// This file is part of Moodle - http://moodle.org/
3//
4// Moodle is free software: you can redistribute it and/or modify
5// it under the terms of the GNU General Public License as published by
6// the Free Software Foundation, either version 3 of the License, or
7// (at your option) any later version.
8//
9// Moodle is distributed in the hope that it will be useful,
10// but WITHOUT ANY WARRANTY; without even the implied warranty of
11// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12// GNU General Public License for more details.
13//
14// You should have received a copy of the GNU General Public License
15// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
16
17/**
18 * Quiz attempt walk through using data from csv file.
19 *
e68e4ccf 20 * @package quiz_statistics
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21 * @category phpunit
22 * @copyright 2013 The Open University
23 * @author Jamie Pratt <me@jamiep.org>
24 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
25 */
26
27defined('MOODLE_INTERNAL') || die();
28
29global $CFG;
30require_once($CFG->dirroot . '/mod/quiz/tests/attempt_walkthrough_from_csv_test.php');
31require_once($CFG->dirroot . '/mod/quiz/report/default.php');
32require_once($CFG->dirroot . '/mod/quiz/report/statistics/report.php');
33require_once($CFG->dirroot . '/mod/quiz/report/reportlib.php');
3652dddd 34
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35/**
36 * Quiz attempt walk through using data from csv file.
37 *
e68e4ccf 38 * @package quiz_statistics
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39 * @category phpunit
40 * @copyright 2013 The Open University
41 * @author Jamie Pratt <me@jamiep.org>
42 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
43 */
8e328617 44class quiz_report_statistics_from_steps_testcase extends mod_quiz_attempt_walkthrough_from_csv_testcase {
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45
46 /**
47 * @var quiz_statistics_report object to do stats calculations.
48 */
49 protected $report;
50
51 protected function get_full_path_of_csv_file($setname, $test) {
52 // Overridden here so that __DIR__ points to the path of this file.
53 return __DIR__."/fixtures/{$setname}{$test}.csv";
54 }
55
56 protected $files = array('questions', 'steps', 'results', 'qstats');
57
58 /**
59 * Create a quiz add questions to it, walk through quiz attempts and then check results.
60 *
61 * @param PHPUnit_Extensions_Database_DataSet_ITable[] of data read from csv file "questionsXX.csv",
62 * "stepsXX.csv" and "resultsXX.csv".
63 * @dataProvider get_data_for_walkthrough
64 */
764f6153 65 public function test_walkthrough_from_csv($quizsettings, $csvdata) {
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66
67 // CSV data files for these tests were generated using :
68 // https://github.com/jamiepratt/moodle-quiz-tools/tree/master/responsegenerator
69
70 $this->resetAfterTest(true);
71 question_bank::get_qtype('random')->clear_caches_before_testing();
72
764f6153 73 $this->create_quiz($quizsettings, $csvdata['questions']);
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74
75 $attemptids = $this->walkthrough_attempts($csvdata['steps']);
76
77 $this->check_attempts_results($csvdata['results'], $attemptids);
78
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79 $this->report = new quiz_statistics_report();
80 $whichattempts = QUIZ_GRADEAVERAGE;
81 $groupstudents = array();
82 $questions = $this->report->load_and_initialise_questions_for_calculations($this->quiz);
83 list($quizstats, $questionstats, $subquestionstats) =
8da6fc9d 84 $this->report->get_all_stats_and_analysis($this->quiz, $whichattempts, $groupstudents, $questions);
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85
86 $qubaids = quiz_statistics_qubaids_condition($this->quiz->id, $groupstudents, $whichattempts);
87
88 // We will create some quiz and question stat calculator instances and some response analyser instances, just in order
89 // to check the time of the
8da6fc9d 90 $quizcalc = new \quiz_statistics\calculator();
487e7e66 91 // Should not be a delay of more than one second between the calculation of stats above and here.
7d6b28d8 92 $this->assertTimeCurrent($quizcalc->get_last_calculated_time($qubaids));
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93
94 $qcalc = new \core_question\statistics\questions\calculator($questions);
7d6b28d8 95 $this->assertTimeCurrent($qcalc->get_last_calculated_time($qubaids));
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96
97 foreach ($questions as $question) {
98 if (!question_bank::get_qtype($question->qtype, false)->can_analyse_responses()) {
99 continue;
100 }
101 $responesstats = new \core_question\statistics\responses\analyser($question);
7d6b28d8 102 $this->assertTimeCurrent($responesstats->get_last_analysed_time($qubaids));
487e7e66 103 }
3652dddd 104
8e328617 105 // These quiz stats and the question stats found in qstats00.csv were calculated independently in spreadsheets which are
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106 // available in open document or excel format here :
107 // https://github.com/jamiepratt/moodle-quiz-tools/tree/master/statsspreadsheet
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108
109 // These quiz stats and the position stats here are calculated in stats.xls and stats.ods available, see above github URL.
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110 $quizstatsexpected = array(
111 'median' => 4.5,
112 'firstattemptsavg' => 4.617333332,
113 'allattemptsavg' => 4.617333332,
114 'firstattemptscount' => 25,
115 'allattemptscount' => 25,
116 'standarddeviation' => 0.8117265554,
117 'skewness' => -0.092502502,
118 'kurtosis' => -0.7073968557,
119 'cic' => -87.2230935542,
120 'errorratio' => 136.8294900795,
121 'standarderror' => 1.1106813066
122 );
123
124 foreach ($quizstatsexpected as $statname => $statvalue) {
f9dc4bd7 125 $this->assertEquals($statvalue, $quizstats->$statname, $quizstats->$statname, abs($statvalue) * 1.5e-5);
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126 }
127
128 for ($rowno = 0; $rowno < $csvdata['qstats']->getRowCount(); $rowno++) {
129 $slotqstats = $csvdata['qstats']->getRow($rowno);
130 foreach ($slotqstats as $statname => $slotqstat) {
131 if ($statname !== 'slot') {
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132 $this->assert_stat_equals($questionstats, $subquestionstats, $slotqstats['slot'],
133 null, null, $statname, (float)$slotqstat);
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134 }
135 }
136 }
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137
138 $itemstats = array('s' => 12,
139 'effectiveweight' => null,
140 'discriminationindex' => 35.803933,
141 'discriminativeefficiency' => 39.39393939,
142 'sd' => 0.514928651,
143 'facility' => 0.583333333,
144 'maxmark' => 1,
145 'positions' => '1',
146 'slot' => null,
147 'subquestion' => true);
148 foreach ($itemstats as $statname => $expected) {
149 $this->assert_stat_equals($questionstats, $subquestionstats, 1, null, 'numerical', $statname, $expected);
150 }
151 }
152
153 /**
154 * Check that the stat is as expected within a reasonable tolerance.
155 *
156 * @param \core_question\statistics\questions\calculated[] $questionstats
157 * @param \core_question\statistics\questions\calculated_for_subquestion[] $subquestionstats
158 * @param int $slot
159 * @param int|null $variant if null then not a variant stat.
160 * @param string|null $subqname if null then not an item stat.
161 * @param string $statname
162 * @param float $expected
163 */
164 protected function assert_stat_equals($questionstats, $subquestionstats, $slot, $variant, $subqname, $statname, $expected) {
165
166 if ($variant === null && $subqname === null) {
167 $actual = $questionstats[$slot]->{$statname};
168 } else if ($subqname !== null) {
169 $actual = $subquestionstats[$this->randqids[$slot][$subqname]]->{$statname};
170 } else {
171 $actual = $questionstats[$slot]->variantstats[$variant]->{$statname};
172 }
173 if (is_bool($expected) || is_string($expected)) {
174 $this->assertEquals($expected, $actual, "$statname for slot $slot");
175 } else {
176 switch ($statname) {
177 case 'covariance' :
178 case 'discriminationindex' :
179 case 'discriminativeefficiency' :
180 case 'effectiveweight' :
181 $precision = 1e-5;
182 break;
183 default :
184 $precision = 1e-6;
185 }
186 $delta = abs($expected) * $precision;
187 $this->assertEquals(floatval($expected), $actual, "$statname for slot $slot", $delta);
188 }
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189 }
190}