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Journal of Educational…

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Meijer, Rob R.	2
van Krimpen-Stoop, Edith M.…	1

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Detection of Person Misfit in Computerized Adaptive Tests with Polytomous Items. Research Report.

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van Krimpen-Stoop, Edith M. L. A.; Meijer, Rob R. – 2000

Item scores that do not fit an assumed item response theory model may cause the latent trait value to be estimated inaccurately. For computerized adaptive tests (CAT) with dichotomous items, several person-fit statistics for detecting nonfitting item score patterns have been proposed. Both for paper-and-pencil (P&P) test and CATs, detection of…

Descriptors: Adaptive Testing, Computer Assisted Testing, Goodness of Fit, Item Response Theory

Using Patterns of Summed Scores in Paper-and-Pencil Tests and Computer-Adaptive Tests to Detect Misfitting Item Score Patterns

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Meijer, Rob R. – Journal of Educational Measurement, 2004

Two new methods have been proposed to determine unexpected sum scores on sub-tests (testlets) both for paper-and-pencil tests and computer adaptive tests. A method based on a conservative bound using the hypergeometric distribution, denoted p, was compared with a method where the probability for each score combination was calculated using a…

Descriptors: Probability, Adaptive Testing, Item Response Theory, Scores