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The Matching Criterion Purification For Differential Item Functioning Analyses In A Large-Scale Assessment, Hyesun Lee, Kurt F. Geisinger

Department of Educational Psychology: Faculty Publications

The current study investigated the impact of matching criterion purification on the accuracy of differential item functioning (DIF) detection in large-scale assessments. The three matching approaches for DIF analyses (block-level matching, pooled booklet matching, and equated pooled booklet matching) were employed with the Mantel– Haenszel procedure. Five factors—the length of a test, the proportion of items exhibiting DIF, a sample size, a ratio of a reference and focal group, and the existence of an average ability difference between two groups—were manipulated. The three matching approaches were used with and without purification. Also, a systematic test form difference was considered. The …