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ERIC Number: ED378195
Record Type: Non-Journal
Publication Date: 1994-Apr
Pages: 21
Abstractor: N/A
Reference Count: N/A
A Simultaneous Approach to Multi-Factor DIF Analysis.
Tang, Huixing
A method is presented for the simultaneous analysis of differential item functioning (DIF) in multi-factor situations. The method is unique in that it combines item response theory (IRT) and analysis of variance (ANOVA), takes a simultaneous approach to multifactor DIF analysis, and is capable of capturing interaction and controlling for possible confounding variables. It is referred to as the IRT-ANOVA method. The most salient feature is that the procedure used IRT to control for group ability differences and familiar inferential procedures to test the DIF effect. Residuals can be construed as item scores free from the effects of both personal ability and item difficulty. The use of ANOVA provides not only a test statistic based on a familiar distribution, but also descriptive measures of DIF magnitude in terms of group means and variances. Simulations in the one-factor, two-group situation reveal the usefulness of the approach and indicate error rates. Seven figures illustrate the simulations. (Contains 8 references.) (SLD)
Publication Type: Reports - Evaluative; Speeches/Meeting Papers
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A