Need another option for multiple choice question configuration [#2438733]

There are two Default scoring options on the Question configuration page for Multiple choice questions.

They are:

1. Give minus one point for incorrect answers.

2. Give one point for each incorrect option that hasn't been chosen.

I would never use either one of those in the courses I teach.

We really need a third option:

3. Give each incorrect answer a score of 0.

Comments

Comment #1

sandra@digitalworldbiology.com CreditAttribution: sandra@digitalworldbiology.com commented 25 February 2015 at 23:33

The best choice would be to have the option to set the lowest question score at zero. That keeps us from ending up with negative scores for questions.

Comment #2

djdevin

Philadelphia

CreditAttribution: djdevin commented 26 February 2015 at 01:52

There's this method called 'MultichoiceQuestion::forgive'

It tries to "fix" your score if chosen/not chosen points. In case this, it's fixing them incorrectly.

I vote that we get rid of it and just obey the point values.

/**
   * Forgive some possible logical flaws in the user input.
   */
  private function forgive() {
    if ($this->node->choice_multi == 1) {
      for ($i = 0; isset($this->node->alternatives[$i]); $i++) {
        $short = &$this->node->alternatives[$i];
        // If the scoring data doesn't make sense, use the data from the "correct" checkbox to set the score data
        if ($short['score_if_chosen'] == $short['score_if_not_chosen'] || !is_numeric($short['score_if_chosen']) || !is_numeric($short['score_if_not_chosen'])) {
          if (!empty($short['correct'])) {
            $short['score_if_chosen'] = 1;
            $short['score_if_not_chosen'] = 0;
          }
          else {
            if (variable_get('multichoice_def_scoring', 0) == 0) {
              $short['score_if_chosen'] = -1;
              $short['score_if_not_chosen'] = 0;
            }
            elseif (variable_get('multichoice_def_scoring', 0) == 1) {
              $short['score_if_chosen'] = 0;
              $short['score_if_not_chosen'] = 1;
            }
          }
        }
      }
    }
    else {
      // For questions with one, and only one, correct answer, there will be no points awarded for alternatives
      // not chosen.
      for ($i = 0; isset($this->node->alternatives[$i]); $i++) {
        $short = &$this->node->alternatives[$i];
        $short['score_if_not_chosen'] = 0;
        if (isset($short['correct']) && $short['correct'] == 1 && !_quiz_is_int($short['score_if_chosen'], 1)) {
          $short['score_if_chosen'] = 1;
        }
      }
    }
  }