Discussion
Following are the statements of Assertion (A) and Reason (R). Answer them with the help of the following codes :
Assertion (A) : IRT is commonly used in computerized psychological testing to estimate ability.
Reason (R) : In IRT, four parameters can be estimated.
Answer: B
Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(A) is true: item response theory (IRT) underlies computerized adaptive testing, where each item is chosen according to the test-taker's estimated ability and the ability estimate is updated after each response.
(R) is also true: IRT models can estimate up to four item parameters (discrimination, difficulty, a lower asymptote for guessing and an upper asymptote) in the four-parameter logistic model. But the number of parameters is not why IRT suits computerized testing; that comes from its estimation of ability on a common scale from any set of items. So (R) does not explain (A).
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