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Cao, Mengyang; Tay, Louis; Liu, Yaowu – Educational and Psychological Measurement, 2017
This study examined the performance of a proposed iterative Wald approach for detecting differential item functioning (DIF) between two groups when preknowledge of anchor items is absent. The iterative approach utilizes the Wald-2 approach to identify anchor items and then iteratively tests for DIF items with the Wald-1 approach. Monte Carlo…
Descriptors: Monte Carlo Methods, Test Items, Test Bias, Error of Measurement
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Tay, Louis; Huang, Qiming; Vermunt, Jeroen K. – Educational and Psychological Measurement, 2016
In large-scale testing, the use of multigroup approaches is limited for assessing differential item functioning (DIF) across multiple variables as DIF is examined for each variable separately. In contrast, the item response theory with covariate (IRT-C) procedure can be used to examine DIF across multiple variables (covariates) simultaneously. To…
Descriptors: Item Response Theory, Test Bias, Simulation, College Entrance Examinations