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ERIC Number: ED359190
Record Type: Non-Journal
Publication Date: 1993-Mar
Pages: 15
Abstractor: N/A
Reference Count: N/A
Identification of Non-Uniform Differential Item Functioning Using a Variation of the Mantel-Haenszel Procedure.
Mazor, Kathleen M.; And Others
The Mantel-Haenszel (MH) procedure has become one of the most popular procedures for detecting differential item functioning (DIF). One of the most troublesome criticisms of this procedure is that while detection rates for uniform DIF are very good, the procedure is not sensitive to non-uniform DIF. In this study, examinee responses were generated to simulate both uniform and non-uniform DIF. Responses for 3 groups of 1,000 examinees (1 reference group and 2 focal groups) were simulated using a 3-parameter logistic item response theory model. A standard MH procedure was used first. Then examinees were split into two samples, by breaking the full sample at approximately the middle of the test score distribution. The tests (25 simulated tests) were then re-analyzed, first with the low performing sample, and then with the high performing sample. This variation improved detection rates of non-uniform DIF considerably over the total sample procedure without increasing the Type I error rate. Items with the largest differences in discrimination and difficulty parameters were most likely to be identified. Two tables present study data. (Author/SLD)
Publication Type: Reports - Evaluative; Speeches/Meeting Papers
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A