Differential Item Functioning Detection Using the Multiple Indicators, Multiple Causes Method with a Pure Short Anchor  

Oleh:

Ching-Lin, Shih ; Wen-Chung, Wang

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Applied Psychological Measurement vol. 33 no. 3 (May 2009), page 184-199.
Topik: differential item functioning; MIMIC; matching variable; Rasch model; item response theory
Fulltext: 184.pdf (172.0KB)

Isi artikel

The multiple indicators, multiple causes (MIMIC) method with a pure short anchor was proposed to detect differential item functioning (DIF). A simulation study showed that the MIMIC method with an anchor of 1, 2, 4, or 10 DIF-free items yielded a well-controlled Type I error rate even when such tests contained as many as 40% DIF items. In general, a longer anchor increased the power of DIF detection, and a 4-item anchor was long enough to yield a high power of DIF detection. An iterative MIMIC procedure was proposed to locate a set of DIF-free items to function as a pure anchor so that the MIMIC method could proceed properly. In another simulation study, it was found that this iterative procedure yielded a perfect (or nearly perfect) rate of accuracy in locating a set of up to 4 DIF-free items.

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