When evaluating a quiz I have the option to see varoius helpful statistics (such as a discrimination index) for the quiz or for individual questions.

As a teacher I would like to get more detailed insights on specific items in a questions. The discrimination index for each item would be helpful to identify items that have been answered correctly by otherwise low performing students in the quiz (and vice versa).

Currently the "Analysis of responses" for a question provides a count (number of students that answered this item option) and a (broken?) frequency, that displays a percentage (however this shows nonsensical values like 300% that are multiples of the count).