How does D2L calculate discrimination indexes?

A Faye.B.329
A Faye.B.329 Posts: 2 New Community Member
edited July 16 in Evaluate - Assess Student Learning

How does D2L calculate discrimination indexes for quiz questions? I'm analyzing question responses from D2L and some recorded elsewhere for which I need to calculate discrimination indexes the same way that D2L calculates them.

Thank you very much!

Faye

Georgia State University, borthick@gsu.edu

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Answers

  • Victor.B.4864
    Victor.B.4864 Posts: 8

    Hi Faye,

    Discrimination Index: This calculates any possible discrimination in the question between the higher and lower performing learners by subtracting the question's lower 27% from its upper 27%. The higher the difference, the better the question discriminates between high and low performing learners. A negative value indicates that more low performing learners are correctly answering the question than high performing learners. This would most likely indicate a flawed quiz question.

    You can find more information in this article

    Best Regards,

    Victor

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