期刊
EDUCATIONAL AND PSYCHOLOGICAL MEASUREMENT
卷 69, 期 5, 页码 713-731出版社
SAGE PUBLICATIONS INC
DOI: 10.1177/0013164409332228
关键词
differential item functioning; scale purification; item response theory; confirmatory factor analysis; MIMIC
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 false-positive rates and yielding higher true-positive rates. Only when the DIF pattern is balanced between groups or when there is a small percentage of DIF items in the test does M-ST perform as appropriately as M-SP. Moreover, both methods yield a higher true-positive rate under the two-parameter logistic model than under the three-parameter model. M-SP is preferable to M-ST, because DIF patterns in real tests are unlikely to be perfectly balanced and the percentages of DIF items may not be small.
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