Thank you for the opportunity to help you with your question!
Item discrimination refers to the ability of an item to differentiate
among students on the basis of how well they know the material being
tested.Computer computation yields more robust assessment of the discrimination
power of items because they take into consideration all students
responses rather than just high and low scoring groups. Similarly, it is
relevant for buildup instructors' skills in test development, and
distinguishing explicit regions of course content, which need
exceptional explicitness. Item discrimination shows the degree to which
favorable outcome on a material is identical to success on the entire
test since all materials in a test are meant to stand shoulder to
shoulder to produce an overall test score. Any material lacking positive
qualities or zero discrimination weakens the test. Positive item
discrimination is usually prolific, unless it is so high that the
material simply duplicates the information produced by other materials
on the test
Please let me know if you need any clarification. I'm always happy to answer your questions.
Sep 2nd, 2015
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