Discuss what is meant by item discrimination. How can it be assessed?

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Discuss what is meant by item discrimination. How can it be assessed? What are the consequences for item selection when the criteria are total test scores as opposed to external scores?

Sep 2nd, 2015

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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

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Sep 2nd, 2015

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