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What is meant by trait level and item difficulty in IRT (Item Response Theory)? Provide an example...

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Psychology

What is meant by trait level and item difficulty in IRT (ItemResponse Theory)?

Provide an example with two items to illustrate. If an item hasa difficulty level of 2.0,

then what is trait level for someone who has a .50/.50probability of getting it correct?

Answer & Explanation Solved by verified expert
3.6 Ratings (570 Votes)
ANSItem response theoryIRTIt was the theory developed in 1970 for the Scholastic aptitute test SAT The estimation is based on a set of parameter values for predicting the desired results It has broader analysis potential than the standard classical testing exams used earlier for    See Answer
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