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An Examination Of Type I Errors And Power For Two Differential Item Functioning Indices, Patrick Carl Clark Jr.
An Examination Of Type I Errors And Power For Two Differential Item Functioning Indices, Patrick Carl Clark Jr.
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This study examined two methods for detecting differential item functioning (DIF): Raju, van der Linden, and Fleer's (1995) differential functioning of items and tests procedure (DFIT) and Thissen, Steinberg, and Wainer's (1988) likelihood ratio test (LRT). The major research questions concerned which test provides the best balance of Type I errors and power and if the tests differ in terms of detecting different types of DIF. Monte Carlo simulations were conducted to address these questions. Equal and unequal sample size conditions were fully crossed with test lengths of 10 and 20 items. In addition, α and β parameters were manipulated …