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Applied Psychological Measurement, Vol. 17, No. 4, 335-350 (1993)
DOI: 10.1177/014662169301700402

Detection of Differential Item Functioning in the Graded Response Model

Allan S. Cohen

University of Wisconsin

Seock-Ho Kim

University of Wisconsin

Frank B. Baker

University of Wisconsin

Methods for detecting differential item func tioning (DIF) have been proposed primarily for the item response theory dichotomous response model. Three measures of DIF for the dichotomous response model are extended to include Samejima's graded response model: two measures based on area differences between item true score functions, and a {chi}2 statistic for comparing differences in item parameters. An illustrative example is presented.

Key Words: Index terms: differential item functioning • graded response model • item response theory.


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