An item response curve relates the performance of examinees on test items to their estimated standings on a hypothetical latent ability continuum.

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An item response curve (also known as an item characteristic curve) graphically represents the relationship between the probability of a correct response to a test item and the examinee's position on a latent trait or ability continuum, illustrating how item difficulty and examinee ability interact.

An Item Response Curve Relates the Performance of Examinees on Test