/**
* Create a quiz add questions to it, walk through quiz attempts and then check results.
*
* @param PHPUnit_Extensions_Database_DataSet_ITable[] of data read from csv file "questionsXX.csv",
* "stepsXX.csv" and "resultsXX.csv".
* @dataProvider get_data_for_walkthrough
*/
public function test_walkthrough_from_csv($quizsettings, $csvdata)
{
// CSV data files for these tests were generated using :
// https://github.com/jamiepratt/moodle-quiz-tools/tree/master/responsegenerator
$this->resetAfterTest(true);
question_bank::get_qtype('random')->clear_caches_before_testing();
$this->create_quiz($quizsettings, $csvdata['questions']);
$attemptids = $this->walkthrough_attempts($csvdata['steps']);
$this->check_attempts_results($csvdata['results'], $attemptids);
$this->report = new quiz_statistics_report();
$whichattempts = QUIZ_GRADEAVERAGE;
$groupstudents = array();
$questions = $this->report->load_and_initialise_questions_for_calculations($this->quiz);
list($quizstats, $questionstats, $subquestionstats) = $this->report->get_quiz_and_questions_stats($this->quiz, $whichattempts, $groupstudents, $questions);
$qubaids = quiz_statistics_qubaids_condition($this->quiz->id, $groupstudents, $whichattempts);
// We will create some quiz and question stat calculator instances and some response analyser instances, just in order
// to check the time of the
$quizcalc = new quiz_statistics_calculator();
// Should not be a delay of more than one second between the calculation of stats above and here.
$this->assertTimeCurrent($quizcalc->get_last_calculated_time($qubaids));
$qcalc = new \core_question\statistics\questions\calculator($questions);
$this->assertTimeCurrent($qcalc->get_last_calculated_time($qubaids));
foreach ($questions as $question) {
if (!question_bank::get_qtype($question->qtype, false)->can_analyse_responses()) {
continue;
}
$responesstats = new \core_question\statistics\responses\analyser($question);
$this->assertTimeCurrent($responesstats->get_last_analysed_time($qubaids));
}
// These quiz stats and the question stats found in qstats00.csv were calculated independently in spreadsheet which is
// available in open document or excel format here :
// https://github.com/jamiepratt/moodle-quiz-tools/tree/master/statsspreadsheet
$quizstatsexpected = array('median' => 4.5, 'firstattemptsavg' => 4.617333332, 'allattemptsavg' => 4.617333332, 'firstattemptscount' => 25, 'allattemptscount' => 25, 'standarddeviation' => 0.8117265554, 'skewness' => -0.092502502, 'kurtosis' => -0.7073968557, 'cic' => -87.22309355420001, 'errorratio' => 136.8294900795, 'standarderror' => 1.1106813066);
foreach ($quizstatsexpected as $statname => $statvalue) {
$this->assertEquals($statvalue, $quizstats->{$statname}, $quizstats->{$statname}, abs($statvalue) * 1.5E-5);
}
for ($rowno = 0; $rowno < $csvdata['qstats']->getRowCount(); $rowno++) {
$slotqstats = $csvdata['qstats']->getRow($rowno);
foreach ($slotqstats as $statname => $slotqstat) {
if ($statname !== 'slot') {
switch ($statname) {
case 'covariance':
case 'discriminationindex':
case 'discriminativeefficiency':
case 'effectiveweight':
$precision = 1.0E-5;
break;
default:
$precision = 1.0E-6;
}
$slot = $slotqstats['slot'];
$delta = abs($slotqstat) * $precision;
$actual = $questionstats[$slot]->{$statname};
$this->assertEquals(floatval($slotqstat), $actual, "{$statname} for slot {$slot}", $delta);
}
}
}
}
/**
* Get the quiz and question statistics, either by loading the cached results,
* or by recomputing them.
*
* @param object $quiz the quiz settings.
* @param string $whichattempts which attempts to use, represented internally as one of the constants as used in
* $quiz->grademethod ie.
* QUIZ_GRADEAVERAGE, QUIZ_GRADEHIGHEST, QUIZ_ATTEMPTLAST or QUIZ_ATTEMPTFIRST
* we calculate stats based on which attempts would affect the grade for each student.
* @param array $groupstudents students in this group.
* @param array $questions full question data.
* @return array with 4 elements:
* - $quizstats The statistics for overall attempt scores.
* - $questionstats array of \core_question\statistics\questions\calculated objects keyed by slot.
* - $subquestionstats array of \core_question\statistics\questions\calculated_for_subquestion objects keyed by question id.
*/
public function get_quiz_and_questions_stats($quiz, $whichattempts, $groupstudents, $questions)
{
$qubaids = quiz_statistics_qubaids_condition($quiz->id, $groupstudents, $whichattempts);
$qcalc = new \core_question\statistics\questions\calculator($questions);
$quizcalc = new quiz_statistics_calculator();
if ($quizcalc->get_last_calculated_time($qubaids) === false) {
// Recalculate now.
list($questionstats, $subquestionstats) = $qcalc->calculate($qubaids);
$quizstats = $quizcalc->calculate($quiz->id, $whichattempts, $groupstudents, count($questions), $qcalc->get_sum_of_mark_variance());
if ($quizstats->s()) {
$this->analyse_responses_for_all_questions_and_subquestions($qubaids, $questions, $subquestionstats);
}
} else {
$quizstats = $quizcalc->get_cached($qubaids);
list($questionstats, $subquestionstats) = $qcalc->get_cached($qubaids);
}
return array($quizstats, $questionstats, $subquestionstats);
}
