Running head: DIF WITH PASSAGE-BASED TESTLETS Using Five Procedures to Detect DIF with Passage-Based Testlets
نویسندگان
چکیده
The objective of this study was to assess differential item functioning (DIF) for passage-based reading testlets across two gender groups using five procedures and then to compare the results across the procedures. The five procedures were: (1) polytomous logistic regression (PLR; Zumbo, 1999), (2) graded response model (GRM; Samejima, 1969, 1997), (3) Mantel-Haenszel (MH; Zwick, Donoghue, & Grima, 1993), (4) polytomous SIBTEST (Poly-SIBTEST; Chang, Mazzeo, & Roussos, 1996), and (5) testlet response theory model (TRTM; Wang, Bradlow and Wainer, 2002). Consistent results were produced between the PLR, MH, and Poly-SIBTEST procedures but not the other two. A simulation study was called for to evaluate the accuracy of each procedure in the passage-based testlet situation.
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