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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  namespace quiz_statistics;
  18  
  19  use question_attempt;
  20  use question_bank;
  21  use question_finder;
  22  use quiz_statistics_report;
  23  
  24  defined('MOODLE_INTERNAL') || die();
  25  
  26  global $CFG;
  27  require_once($CFG->dirroot . '/mod/quiz/tests/attempt_walkthrough_from_csv_test.php');
  28  require_once($CFG->dirroot . '/mod/quiz/report/default.php');
  29  require_once($CFG->dirroot . '/mod/quiz/report/statistics/report.php');
  30  require_once($CFG->dirroot . '/mod/quiz/report/reportlib.php');
  31  
  32  /**
  33   * Quiz attempt walk through using data from csv file.
  34   *
  35   * The quiz stats below and the question stats found in qstats00.csv were calculated independently in a spreadsheet which is
  36   * available in open document or excel format here :
  37   * https://github.com/jamiepratt/moodle-quiz-tools/tree/master/statsspreadsheet
  38   *
  39   * Similarly the question variant's stats in qstats00.csv are calculated in stats_for_variant_1.xls and stats_for_variant_8.xls
  40   * The calculations in the spreadsheets are the same as for the other question stats but applied just to the attempts where the
  41   * variants appeared.
  42   *
  43   * @package    quiz_statistics
  44   * @category   test
  45   * @copyright  2013 The Open University
  46   * @author     Jamie Pratt <me@jamiep.org>
  47   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  48   */
  49  class stats_from_steps_walkthrough_test extends \mod_quiz\attempt_walkthrough_from_csv_test {
  50  
  51      /**
  52       * @var quiz_statistics_report object to do stats calculations.
  53       */
  54      protected $report;
  55  
  56      protected function get_full_path_of_csv_file($setname, $test) {
  57          // Overridden here so that __DIR__ points to the path of this file.
  58          return  __DIR__."/fixtures/{$setname}{$test}.csv";
  59      }
  60  
  61      protected $files = array('questions', 'steps', 'results', 'qstats', 'responsecounts');
  62  
  63      /**
  64       * Create a quiz add questions to it, walk through quiz attempts and then check results.
  65       *
  66       * @param array $csvdata data read from csv file "questionsXX.csv", "stepsXX.csv" and "resultsXX.csv".
  67       * @dataProvider get_data_for_walkthrough
  68       */
  69      public function test_walkthrough_from_csv($quizsettings, $csvdata) {
  70  
  71          $this->create_quiz_simulate_attempts_and_check_results($quizsettings, $csvdata);
  72  
  73          $whichattempts = QUIZ_GRADEAVERAGE; // All attempts.
  74          $whichtries = question_attempt::ALL_TRIES;
  75          $groupstudentsjoins = new \core\dml\sql_join();
  76          list($questions, $quizstats, $questionstats, $qubaids) =
  77                      $this->check_stats_calculations_and_response_analysis($csvdata,
  78                              $whichattempts, $whichtries, $groupstudentsjoins);
  79          if ($quizsettings['testnumber'] === '00') {
  80              $this->check_variants_count_for_quiz_00($questions, $questionstats, $whichtries, $qubaids);
  81              $this->check_quiz_stats_for_quiz_00($quizstats);
  82          }
  83      }
  84  
  85      /**
  86       * Check actual question stats are the same as that found in csv file.
  87       *
  88       * @param $qstats         array data from csv file.
  89       * @param $questionstats  \core_question\statistics\questions\all_calculated_for_qubaid_condition Calculated stats.
  90       */
  91      protected function check_question_stats($qstats, $questionstats) {
  92          foreach ($qstats as $slotqstats) {
  93              foreach ($slotqstats as $statname => $slotqstat) {
  94                  if (!in_array($statname, array('slot', 'subqname'))  && $slotqstat !== '') {
  95                      $this->assert_stat_equals($slotqstat,
  96                                                $questionstats,
  97                                                $slotqstats['slot'],
  98                                                $slotqstats['subqname'],
  99                                                $slotqstats['variant'],
 100                                                $statname);
 101                  }
 102              }
 103              // Check that sub-question boolean field is correctly set.
 104              $this->assert_stat_equals(!empty($slotqstats['subqname']),
 105                                        $questionstats,
 106                                        $slotqstats['slot'],
 107                                        $slotqstats['subqname'],
 108                                        $slotqstats['variant'],
 109                                        'subquestion');
 110          }
 111      }
 112  
 113      /**
 114       * Check that the stat is as expected within a reasonable tolerance.
 115       *
 116       * @param float|string|bool $expected expected value of stat.
 117       * @param \core_question\statistics\questions\all_calculated_for_qubaid_condition $questionstats
 118       * @param int $slot
 119       * @param string $subqname if empty string then not an item stat.
 120       * @param int|string $variant if empty string then not a variantstat.
 121       * @param string $statname
 122       */
 123      protected function assert_stat_equals($expected, $questionstats, $slot, $subqname, $variant, $statname) {
 124  
 125          if ($variant === '' && $subqname === '') {
 126              $actual = $questionstats->for_slot($slot)->{$statname};
 127          } else if ($subqname !== '') {
 128              $actual = $questionstats->for_subq($this->randqids[$slot][$subqname])->{$statname};
 129          } else {
 130              $actual = $questionstats->for_slot($slot, $variant)->{$statname};
 131          }
 132          $message = "$statname for slot $slot";
 133          if ($expected === '**NULL**') {
 134              $this->assertEquals(null, $actual, $message);
 135          } else if (is_bool($expected)) {
 136              $this->assertEquals($expected, $actual, $message);
 137          } else if (is_numeric($expected)) {
 138              switch ($statname) {
 139                  case 'covariance' :
 140                  case 'discriminationindex' :
 141                  case 'discriminativeefficiency' :
 142                  case 'effectiveweight' :
 143                      $precision = 1e-5;
 144                      break;
 145                  default :
 146                      $precision = 1e-6;
 147              }
 148              $delta = abs($expected) * $precision;
 149              $this->assertEqualsWithDelta((float)$expected, $actual, $delta, $message);
 150          } else {
 151              $this->assertEquals($expected, $actual, $message);
 152          }
 153      }
 154  
 155      protected function assert_response_count_equals($question, $qubaids, $expected, $whichtries) {
 156          $responesstats = new \core_question\statistics\responses\analyser($question);
 157          $analysis = $responesstats->load_cached($qubaids, $whichtries);
 158          if (!isset($expected['subpart'])) {
 159              $subpart = 1;
 160          } else {
 161              $subpart = $expected['subpart'];
 162          }
 163          list($subpartid, $responseclassid) = $this->get_response_subpart_and_class_id($question,
 164                                                                                        $subpart,
 165                                                                                        $expected['modelresponse']);
 166  
 167          $subpartanalysis = $analysis->get_analysis_for_subpart($expected['variant'], $subpartid);
 168          $responseclassanalysis = $subpartanalysis->get_response_class($responseclassid);
 169          $actualresponsecounts = $responseclassanalysis->data_for_question_response_table('', '');
 170  
 171          foreach ($actualresponsecounts as $actualresponsecount) {
 172              if ($actualresponsecount->response == $expected['actualresponse'] || count($actualresponsecounts) == 1) {
 173                  $i = 1;
 174                  $partofanalysis = " slot {$expected['slot']}, rand q '{$expected['randq']}', variant {$expected['variant']}, ".
 175                                      "for expected model response {$expected['modelresponse']}, ".
 176                                      "actual response {$expected['actualresponse']}";
 177                  while (isset($expected['count'.$i])) {
 178                      if ($expected['count'.$i] != 0) {
 179                          $this->assertTrue(isset($actualresponsecount->trycount[$i]),
 180                              "There is no count at all for try $i on ".$partofanalysis);
 181                          $this->assertEquals($expected['count'.$i], $actualresponsecount->trycount[$i],
 182                                              "Count for try $i on ".$partofanalysis);
 183                      }
 184                      $i++;
 185                  }
 186                  if (isset($expected['totalcount'])) {
 187                      $this->assertEquals($expected['totalcount'], $actualresponsecount->totalcount,
 188                                          "Total count on ".$partofanalysis);
 189                  }
 190                  return;
 191              }
 192          }
 193          throw new \coding_exception("Expected response '{$expected['actualresponse']}' not found.");
 194      }
 195  
 196      protected function get_response_subpart_and_class_id($question, $subpart, $modelresponse) {
 197          $qtypeobj = question_bank::get_qtype($question->qtype, false);
 198          $possibleresponses = $qtypeobj->get_possible_responses($question);
 199          $possibleresponsesubpartids = array_keys($possibleresponses);
 200          if (!isset($possibleresponsesubpartids[$subpart - 1])) {
 201              throw new \coding_exception("Subpart '{$subpart}' not found.");
 202          }
 203          $subpartid = $possibleresponsesubpartids[$subpart - 1];
 204  
 205          if ($modelresponse == '[NO RESPONSE]') {
 206              return array($subpartid, null);
 207  
 208          } else if ($modelresponse == '[NO MATCH]') {
 209              return array($subpartid, 0);
 210          }
 211  
 212          $modelresponses = array();
 213          foreach ($possibleresponses[$subpartid] as $responseclassid => $subpartpossibleresponse) {
 214              $modelresponses[$responseclassid] = $subpartpossibleresponse->responseclass;
 215          }
 216          $this->assertContains($modelresponse, $modelresponses);
 217          $responseclassid = array_search($modelresponse, $modelresponses);
 218          return array($subpartid, $responseclassid);
 219      }
 220  
 221      /**
 222       * @param $responsecounts
 223       * @param $qubaids
 224       * @param $questions
 225       * @param $whichtries
 226       */
 227      protected function check_response_counts($responsecounts, $qubaids, $questions, $whichtries) {
 228          foreach ($responsecounts as $expected) {
 229              $defaultsforexpected = array('randq' => '', 'variant' => '1', 'subpart' => '1');
 230              foreach ($defaultsforexpected as $key => $expecteddefault) {
 231                  if (!isset($expected[$key])) {
 232                      $expected[$key] = $expecteddefault;
 233                  }
 234              }
 235              if ($expected['randq'] == '') {
 236                  $question = $questions[$expected['slot']];
 237              } else {
 238                  $qid = $this->randqids[$expected['slot']][$expected['randq']];
 239                  $question = question_finder::get_instance()->load_question_data($qid);
 240              }
 241              $this->assert_response_count_equals($question, $qubaids, $expected, $whichtries);
 242          }
 243      }
 244  
 245      /**
 246       * @param $questions
 247       * @param $questionstats
 248       * @param $whichtries
 249       * @param $qubaids
 250       */
 251      protected function check_variants_count_for_quiz_00($questions, $questionstats, $whichtries, $qubaids) {
 252          $expectedvariantcounts = array(2 => array(1  => 6,
 253                                                    4  => 4,
 254                                                    5  => 3,
 255                                                    6  => 4,
 256                                                    7  => 2,
 257                                                    8  => 5,
 258                                                    10 => 1));
 259  
 260          foreach ($questions as $slot => $question) {
 261              if (!question_bank::get_qtype($question->qtype, false)->can_analyse_responses()) {
 262                  continue;
 263              }
 264              $responesstats = new \core_question\statistics\responses\analyser($question);
 265              $this->assertTimeCurrent($responesstats->get_last_analysed_time($qubaids, $whichtries));
 266              $analysis = $responesstats->load_cached($qubaids, $whichtries);
 267              $variantsnos = $analysis->get_variant_nos();
 268              if (isset($expectedvariantcounts[$slot])) {
 269                  // Compare contents, ignore ordering of array, using canonicalize parameter of assertEquals.
 270                  $this->assertEqualsCanonicalizing(array_keys($expectedvariantcounts[$slot]), $variantsnos);
 271              } else {
 272                  $this->assertEquals(array(1), $variantsnos);
 273              }
 274              $totalspervariantno = array();
 275              foreach ($variantsnos as $variantno) {
 276  
 277                  $subpartids = $analysis->get_subpart_ids($variantno);
 278                  foreach ($subpartids as $subpartid) {
 279                      if (!isset($totalspervariantno[$subpartid])) {
 280                          $totalspervariantno[$subpartid] = array();
 281                      }
 282                      $totalspervariantno[$subpartid][$variantno] = 0;
 283  
 284                      $subpartanalysis = $analysis->get_analysis_for_subpart($variantno, $subpartid);
 285                      $classids = $subpartanalysis->get_response_class_ids();
 286                      foreach ($classids as $classid) {
 287                          $classanalysis = $subpartanalysis->get_response_class($classid);
 288                          $actualresponsecounts = $classanalysis->data_for_question_response_table('', '');
 289                          foreach ($actualresponsecounts as $actualresponsecount) {
 290                              $totalspervariantno[$subpartid][$variantno] += $actualresponsecount->totalcount;
 291                          }
 292                      }
 293                  }
 294              }
 295              // Count all counted responses for each part of question and confirm that counted responses, for most question types
 296              // are the number of attempts at the question for each question part.
 297              if ($slot != 5) {
 298                  // Slot 5 holds a multi-choice multiple question.
 299                  // Multi-choice multiple is slightly strange. Actual answer counts given for each sub part do not add up to the
 300                  // total attempt count.
 301                  // This is because each option is counted as a sub part and each option can be off or on in each attempt. Off is
 302                  // not counted in response analysis for this question type.
 303                  foreach ($totalspervariantno as $totalpervariantno) {
 304                      if (isset($expectedvariantcounts[$slot])) {
 305                          // If we know how many attempts there are at each variant we can check
 306                          // that we have counted the correct amount of responses for each variant.
 307                          $this->assertEqualsCanonicalizing($expectedvariantcounts[$slot],
 308                                              $totalpervariantno,
 309                                              "Totals responses do not add up in response analysis for slot {$slot}.");
 310                      } else {
 311                          $this->assertEquals(25,
 312                                              array_sum($totalpervariantno),
 313                                              "Totals responses do not add up in response analysis for slot {$slot}.");
 314                      }
 315                  }
 316              }
 317          }
 318  
 319          foreach ($expectedvariantcounts as $slot => $expectedvariantcount) {
 320              foreach ($expectedvariantcount as $variantno => $s) {
 321                  $this->assertEquals($s, $questionstats->for_slot($slot, $variantno)->s);
 322              }
 323          }
 324      }
 325  
 326      /**
 327       * @param $quizstats
 328       */
 329      protected function check_quiz_stats_for_quiz_00($quizstats) {
 330          $quizstatsexpected = array(
 331              'median'             => 4.5,
 332              'firstattemptsavg'   => 4.617333332,
 333              'allattemptsavg'     => 4.617333332,
 334              'firstattemptscount' => 25,
 335              'allattemptscount'   => 25,
 336              'standarddeviation'  => 0.8117265554,
 337              'skewness'           => -0.092502502,
 338              'kurtosis'           => -0.7073968557,
 339              'cic'                => -87.2230935542,
 340              'errorratio'         => 136.8294900795,
 341              'standarderror'      => 1.1106813066
 342          );
 343  
 344          foreach ($quizstatsexpected as $statname => $statvalue) {
 345              $this->assertEqualsWithDelta($statvalue, $quizstats->$statname, abs($statvalue) * 1.5e-5, $quizstats->$statname);
 346          }
 347      }
 348  
 349      /**
 350       * Check the question stats and the response counts used in the statistics report. If the appropriate files exist in fixtures/.
 351       *
 352       * @param array $csvdata Data loaded from csv files for this test.
 353       * @param string $whichattempts
 354       * @param string $whichtries
 355       * @param \core\dml\sql_join $groupstudentsjoins
 356       * @return array with contents 0 => $questions, 1 => $quizstats, 2=> $questionstats, 3=> $qubaids Might be needed for further
 357       *               testing.
 358       */
 359      protected function check_stats_calculations_and_response_analysis($csvdata, $whichattempts, $whichtries,
 360              \core\dml\sql_join $groupstudentsjoins) {
 361          $this->report = new quiz_statistics_report();
 362          $questions = $this->report->load_and_initialise_questions_for_calculations($this->quiz);
 363          list($quizstats, $questionstats) = $this->report->get_all_stats_and_analysis($this->quiz,
 364                                                                                       $whichattempts,
 365                                                                                       $whichtries,
 366                                                                                       $groupstudentsjoins,
 367                                                                                       $questions);
 368  
 369          $qubaids = quiz_statistics_qubaids_condition($this->quiz->id, $groupstudentsjoins, $whichattempts);
 370  
 371          // We will create some quiz and question stat calculator instances and some response analyser instances, just in order
 372          // to check the last analysed time then returned.
 373          $quizcalc = new calculator();
 374          // Should not be a delay of more than one second between the calculation of stats above and here.
 375          $this->assertTimeCurrent($quizcalc->get_last_calculated_time($qubaids));
 376  
 377          $qcalc = new \core_question\statistics\questions\calculator($questions);
 378          $this->assertTimeCurrent($qcalc->get_last_calculated_time($qubaids));
 379  
 380          if (isset($csvdata['responsecounts'])) {
 381              $this->check_response_counts($csvdata['responsecounts'], $qubaids, $questions, $whichtries);
 382          }
 383          if (isset($csvdata['qstats'])) {
 384              $this->check_question_stats($csvdata['qstats'], $questionstats);
 385              return array($questions, $quizstats, $questionstats, $qubaids);
 386          }
 387          return array($questions, $quizstats, $questionstats, $qubaids);
 388      }
 389  
 390  }