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> Test Manager-point Biserial Data
Posted: Oct 31 2007, 02:05 AM

It would be great if you could add Point Biserial calculations to the results in the Test Manager.

The Point Biserial is an excellent measure of the validity of a question. It isn't really helpful to know that 88% of the students got A for the correct answer and 12% got C for the wrong answer. It might be a case of the 12% being most of the students who scored high on the whole exam and this group saw something in the distractor in answer C. This would be an example of a question that penalizes the "good" students who know the material.

I don't believe that it would be too difficult to add as it is just a formula that takes the top 25% on the overall test and the bottom 25% on the overall test and compares how they did on each question.
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Support KL
Posted: Oct 31 2007, 08:21 AM

Thank you we will add this to our suggestion list.
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