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Applied Psychological Measurement, Vol. 26, No. 1, 77-87 (2002)
DOI: 10.1177/0146621602261005

The Effect of Item Parameter Drift on Examinee Ability Estimates

Craig S. Wells

cswells{at}students.wisc.edu

Michael J. Subkoviak

subko{at}education.wisc.edu

Ronald C. Serlin

University of Wisconsin—Madisonrcserlin{at}facstaff.wisc.edu.

This study investigated the effect of item parameter drift on ability estimates under item response theory. Item response data for two testing occasions were simulated for the two-parameter logistic model under the following crossed conditions: test length, sample size, percentage of drifting items, and type of drift. Results indicated that item parameter drift, under the conditions simulated, had a small effect on ability estimates.


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