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ERIC Number: ED383739
Record Type: Non-Journal
Publication Date: 1995-Apr-18
Pages: 30
Abstractor: N/A
Reference Count: N/A
Differential Item Functioning from a Multilevel Perspective.
van den Bergh, Huub; And Others
The term differential item functioning (DIF) refers to whether or not the same psychological constructs are measured across different groups. If an item does not measure the same skills or subskills in different populations, it is said to function differentially or to display item bias. A multilevel approach to DIF is proposed. In such a model, the dependency between observations due to cluster effects is explicitly taken into account. Results of a multilevel logit model and of a multilevel logistic regression model are compared with results of analogous unilevel models. The procedure is illustrated with data from a national assessment of geography performed with respect to gender bias. Each of the 294 items was answered by an average of 2,161 respondents. Analysis supports the use of multilevel models, which have the advantage of accounting for cluster effects in data from a hierarchical population. DIF does seem to be more stable according to multilevel models than to unilevel models. Five tables and four figures present analysis results. Appendixes provide parameter estimates. (Contains 19 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