Quiz Item Analysis of Multianswers Question Types
This page described a code proposal to access the embedded questions data in multianswers questiion types so that they can be displayed in the Item analysis report. See http://moodle.org/mod/forum/discuss.php?d=86598#387154 The code is experimental and need more testing and is not optimized.
All question types to be analyzed contain at least one embedded question
If we set this as a general framework, the code will be valid for all question types.
We need a question type function to retrieve the embedded questions
There is actually no question type function to know the number the embedded questions in a question. The default function number_of_embedded_questions() returns 1;
This is not the same as actual_number_of_questions().
We need a convention of how to store the responses from the different embedded questions
The same convention should be used in the $session states and in the get_responses function. The actual responses convention used an array to contains the different answers and put in [''] element the actual response. an example for a numerical question with the tolerance limit
stdClass Object ( [id] => 2312 [responses] => Array ( [6837] => stdClass Object ( [answer] => 1822 (1817..1827) [credit] => 1 ) ) )
In a multianswers qtype the different answers responses are stored in an array as.
stdClass Object ( [id] => 2815 [responses] => Array ( [1] => stdClass Object ( [id] => 2816 [responses] => Array ( [7300] => stdClass Object ( [answer] => Wrong answer [credit] => 0 ) [7302] => stdClass Object ( [answer] => Correct answer [credit] => 1 ) [7305] => stdClass Object ( [answer] => Answer that gives half the credit [credit] => 0.5 ) ) ) [2] => stdClass Object ( [id] => 2817 [responses] => Array ( [7303] => stdClass Object ( [answer] => Wrong answer [credit] => 0 ) [7304] => stdClass Object ( [answer] => Correct answer [credit] => 1 ) ) ) [3] => stdClass Object ( [id] => 2818 [responses] => Array ( [7307] => stdClass Object ( [answer] => 65 (64.9..65.1) [credit] => 1 ) ) ) ) )
So the one question question types responses is tranformed in a similar structure.
The upper example becomes
stdClass Object ( [id] => 2312 [responses] => Array ( [0] => stdClass Object ( [id] => 2312 [responses] => Array ( [6837] => stdClass Object ( [answer] => 1822 (1817..1827) [credit] => 1 ) ) ) ) )
The new array elements the defined the responses of the embedded questions and are put in the questions array as subquestions
foreach ($q->responses as $subquestion => $qresponses ){ foreach ($qresponses->responses as $answer => $r) { $r->count = 0; $questions[$qid]['subquestion'][$subquestion]['responses'][$answer] = $r->answer; $questions[$qid]['subquestion'][$subquestion]['rcounts'][$answer] = 0; $questions[$qid]['subquestion'][$subquestion]['credits'][$answer] = $r->credit; $statsrow[$qid]['subquestion'][$subquestion] = 0; }
For a 1 embedded question question type there is just one subquestion with a $subquestion value of 0.
Check response of each subquestion instead of each question
foreach ($responses as $subquestion => $resp ){ if ($resp) { if ($key = array_search($resp, $questions[$qid]['subquestion'][$subquestion]['responses'])) { $questions[$qid]['subquestion'][$subquestion]['rcounts'][$key]++; } else { $test = new stdClass; $test->responses = $QTYPES[$quizquestions[$i]->qtype]->get_correct_responses($quizquestions[$i], $states[$i]); $test->resp = $resp ; $test->keyresp = $subquestion ; $test->question_qid = &$questions[$qid] ; if ($key = $QTYPES[$quizquestions[$i]->qtype]->check_response($quizquestions[$i], $states[$i], $test)) { $questions[$qid]['subquestion'][$subquestion]['rcounts'][$key]++;
if (!$this->debug){ echo "
test cheeck response search OK $key
rcounts
";print_r($questions[$qid][$subquestion]['rcounts']); echo "
";}
} else { $questions[$qid]['subquestion'][$subquestion]['responses'][] = $resp; $questions[$qid]['subquestion'][$subquestion]['rcounts'][] = 1; $questions[$qid]['subquestion'][$subquestion]['credits'][] = 0; } } } }
To distinguish