quiz_statistics_question_stats Class Reference

Inheritance diagram for quiz_statistics_question_stats:

Public Member Functions
	__construct ($questions, $s, $summarksavg)
	load_step_data ($quizid, $currentgroup, $groupstudents, $allattempts)
	compute_statistics ()
	get_sum_of_mark_variance ()
Data Fields
	$questions
	$subquestions = array()
Protected Member Functions
	make_blank_question_stats ()
	initial_steps_walker ($step, $stats, $positionstat=true)
	initial_question_walker ($stats)
	secondary_steps_walker ($step, $stats)
	secondary_question_walker ($stats)
	get_random_guess_score ($questiondata)
Protected Attributes
	$s
	$summarksavg
	$allattempts
	$lateststeps
	$sumofmarkvariance = 0
	$randomselectors = array()

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Detailed Description

This class has methods to compute the question statistics from the raw data.

Copyright:

2008 Jamie Pratt http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

Definition at line 36 of file qstats.php.

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Constructor & Destructor Documentation

__construct	(	$	questions,
		$	s,
		$	summarksavg
	)

Constructor.

Parameters:

$questions	the questions.
$s	the number of attempts included in the stats.
$summarksavg	the average attempt summarks.

Definition at line 56 of file qstats.php.

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Member Function Documentation

compute_statistics

(

)

Definition at line 132 of file qstats.php.

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get_random_guess_score

(

$

questiondata

)

[protected]

Parameters:

object

$questiondata

Returns:

number the random guess score for this question.

Reimplemented in testable_quiz_statistics_question_stats.

Definition at line 394 of file qstats.php.

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get_sum_of_mark_variance

(

)

Used when computing CIC.

Returns:

number

Definition at line 403 of file qstats.php.

initial_question_walker

(

$

stats

)

[protected]

Perform some computations on the per-question statistics calculations after we have been through all the states.

Parameters:

object

$stats

quetsion stats to update.

Definition at line 307 of file qstats.php.

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initial_steps_walker	(	$	step,
		$	stats,
		$	positionstat = true
	)		[protected]

Update $stats->totalmarks, $stats->markarray, $stats->totalothermarks and $stats->othermarksarray to include another state.

Parameters:

object	$step	the state to add to the statistics.
object	$stats	the question statistics we are accumulating.
bool	$positionstat	whether this is a statistic of position of question.

Definition at line 286 of file qstats.php.

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load_step_data	(	$	quizid,
		$	currentgroup,
		$	groupstudents,
		$	allattempts
	)

Load the data that will be needed to perform the calculations.

Parameters:

int	$quizid	the quiz id.
int	$currentgroup	the current group. 0 for none.
array	$groupstudents	students in this group.
bool	$allattempts	use all attempts, or just first attempts.

Definition at line 99 of file qstats.php.

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make_blank_question_stats

(

)

[protected]

Returns:

object ready to hold all the question statistics.

Definition at line 72 of file qstats.php.

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secondary_question_walker

(

$

stats

)

[protected]

Perform more per-question statistics calculations.

Parameters:

object

$stats

quetsion stats to update.

Definition at line 356 of file qstats.php.

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secondary_steps_walker	(	$	step,
		$	stats
	)		[protected]

Now we know the averages, accumulate the date needed to compute the higher moments of the question scores.

Parameters:

object	$step	the state to add to the statistics.
object	$stats	the question statistics we are accumulating.
bool	$positionstat	whether this is a statistic of position of question.

Definition at line 330 of file qstats.php.

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Field Documentation

$allattempts [protected]

Definition at line 42 of file qstats.php.

$lateststeps [protected]

Definition at line 45 of file qstats.php.

$questions

Definition at line 37 of file qstats.php.

$randomselectors = array() [protected]

Definition at line 48 of file qstats.php.

$s [protected]

Definition at line 40 of file qstats.php.

$subquestions = array()

Definition at line 38 of file qstats.php.

$summarksavg [protected]

Definition at line 41 of file qstats.php.

$sumofmarkvariance = 0 [protected]

Definition at line 47 of file qstats.php.

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The documentation for this class was generated from the following file:

• C:/xampp/htdocs/moodle/mod/quiz/report/statistics/qstats.php