Tim Hunt
fb74929e97
We now change so that minfraction is -6 and maxfraction is 3, so getting the question right a low certainty gives maxmark marks, and you get a bonus for being more confident (rather than being penalised for being unconfident). Mathematically it is the same, but the difference is importnat psychologically. We also change how partially correct scores are handled. It is too harsh to penalise a partially correct score with full certainty by doing a linear interpolation between -6 and +3. Instead, any partially correct score (e.g. 0.5) becomes that fraction of the correct score (e.g. 0.5 * 3 = 1.5). Also, any incorrect score is treated as 0, so if you have a multiple choice question that normally gives a negative score for a wrong choice, this will now never give a score of less than -6. Finally we change how this is displayed to students beside the question. Rather than saying "Marked out of 1.00", we say "Base mark 1.00", and then later we say "CBM mark 3.00" (or whatever it is).
57 lines
2.7 KiB
PHP
57 lines
2.7 KiB
PHP
<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* This file contains tests that walks a question through the deferred feedback
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* with certainty base marking behaviour.
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*
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* @package qbehaviour
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* @subpackage deferredcbm
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* @copyright 2009 The Open University
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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defined('MOODLE_INTERNAL') || die();
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global $CFG;
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require_once(dirname(__FILE__) . '/../../../engine/lib.php');
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/**
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* Unit tests for the deferred feedback with certainty base marking behaviour.
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*
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* @copyright 2009 The Open University
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class qbehaviour_deferredcbm_cbm_test extends basic_testcase {
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public function test_adjust_fraction() {
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$this->assertEquals( 1, question_cbm::adjust_fraction( 1, question_cbm::LOW), '', 0.0000001);
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$this->assertEquals( 2, question_cbm::adjust_fraction( 1, question_cbm::MED), '', 0.0000001);
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$this->assertEquals( 3, question_cbm::adjust_fraction( 1, question_cbm::HIGH), '', 0.0000001);
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$this->assertEquals( 0, question_cbm::adjust_fraction( 0, question_cbm::LOW), '', 0.0000001);
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$this->assertEquals(-2, question_cbm::adjust_fraction( 0, question_cbm::MED), '', 0.0000001);
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$this->assertEquals(-6, question_cbm::adjust_fraction( 0, question_cbm::HIGH), '', 0.0000001);
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$this->assertEquals( 0.5, question_cbm::adjust_fraction( 0.5, question_cbm::LOW), '', 0.0000001);
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$this->assertEquals( 1, question_cbm::adjust_fraction( 0.5, question_cbm::MED), '', 0.0000001);
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$this->assertEquals( 1.5, question_cbm::adjust_fraction( 0.5, question_cbm::HIGH), '', 0.0000001);
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$this->assertEquals( 0, question_cbm::adjust_fraction(-0.25, question_cbm::LOW), '', 0.0000001);
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$this->assertEquals(-2, question_cbm::adjust_fraction(-0.25, question_cbm::MED), '', 0.0000001);
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$this->assertEquals(-6, question_cbm::adjust_fraction(-0.25, question_cbm::HIGH), '', 0.0000001);
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}
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}
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