Question

What is the difference between an item difficulty index and an item discrimination index?

   What is the difference between an item difficulty index and an item discrimination index?

Measurement Theory in Action: Case Studies and Exercises

Measurement Theory in Action: Case Studies and Exercises

Kenneth S. Shultz,… 1st Edition

Chapter 12, Problem 1

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The item difficulty index is a measure used in psychometrics to determine how difficult a particular test item is for a group of test-takers. It is typically calculated as the proportion of test-takers who answer the item correctly. A higher value indicates an Show more…

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What is the difference between an item difficulty index and an item discrimination index?

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