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ERIC Number: EJ948266
Record Type: Journal
Publication Date: 2011
Pages: 23
Abstractor: As Provided
Reference Count: 38
ISSN: ISSN-0027-3171
Identification of Differential Item Functioning in Multiple-Group Settings: A Multivariate Outlier Detection Approach
Magis, David; De Boeck, Paul
Multivariate Behavioral Research, v46 n5 p733-755 2011
We focus on the identification of differential item functioning (DIF) when more than two groups of examinees are considered. We propose to consider items as elements of a multivariate space, where DIF items are outlying elements. Following this approach, the situation of multiple groups is a quite natural case. A robust statistics technique is proposed to identify DIF items as outliers in the multivariate space. For low dimensionalities, up to 2-3 groups, a simple graphical tool is derived. We illustrate our approach with a reanalysis of data from Kim, Cohen, and Park (1995) on using calculators for a mathematics test. (Contains 2 tables and 4 figures.)
Psychology Press. Available from: Taylor & Francis, Ltd. 325 Chestnut Street Suite 800, Philadelphia, PA 19106. Tel: 800-354-1420; Fax: 215-625-2940; Web site:
Publication Type: Journal Articles; Reports - Research
Education Level: Higher Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A