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Direct linkWang, Wen-Chung; Shih, Ching-Lin; Yang, Chih-Chien – Educational and Psychological Measurement, 2009
This study implements a scale purification procedure onto the standard MIMIC method for differential item functioning (DIF) detection and assesses its performance through a series of simulations. It is found that the MIMIC method with scale purification (denoted as M-SP) outperforms the standard MIMIC method (denoted as M-ST) in controlling…
Descriptors: Test Items, Measures (Individuals), Test Bias, Evaluation Research
Wang, Wen-Chung; Wilson, Mark – Educational and Psychological Measurement, 2005
This study presents a procedure for detecting differential item functioning (DIF) for dichotomous and polytomous items in testlet-based tests, whereby DIF is taken into account by adding DIF parameters into the Rasch testlet model. Simulations were conducted to assess recovery of the DIF and other parameters. Two independent variables, test type…
Descriptors: Test Format, Test Bias, Item Response Theory, Item Analysis
Wang, Wen-Chung; Chyi-In, Wu – Educational and Psychological Measurement, 2004
Because of the requirement of reporting effect sizes and in the interest of measurement of change within the item response theory framework, their combination becomes a new issue. In the present study, repeated measures are decomposed as an initial ability and one or more modifiabilities (gain score) using a multidimensional Rasch model. The…
Descriptors: Simulation, Effect Size, Item Response Theory, Meta Analysis
