The MIMIC Method With Scale Purification for Detecting Differential Item Functioning  

Oleh:

Wang, Wen-Chung ; Shih, Ching-Lin

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Educational and Psychological Measurement vol. 69 no. 05 (Oct. 2009), page 713-731.
Topik: differential item functioning; scale purification; item response theory; confirmatory factor analysis; MIMIC
Fulltext: 713.pdf (264.11KB)

Isi artikel

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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