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ERIC Number: ED430050
Record Type: Non-Journal
Publication Date: 1999-Apr
Pages: 37
Abstractor: N/A
Reference Count: N/A
ISBN: N/A
ISSN: N/A
Assessing the Effect of Model-Data Misfit on the Invariance Property of IRT Parameter Estimates.
Fan, Xitao; Ping, Yin
This study empirically investigated the potential negative effect of item response theory (IRT) model-data misfit on the degree of invariance of: (1) IRT item parameter estimates (item difficulty and discrimination); and (2) IRT person ability parameter estimates. A large-scale statewide assessment program test database was used, for which the one-parameter IRT has poor model-data fit, and the three-parameter model has exceptionally good model-data fit. Three examinee sampling plans were used to investigating the effect of model-data misfit on the invariance of item parameter estimates, and two test sampling plans were used for investigating the effect of model-data misfit on the invariance property of IRT person ability parameter estimates. Overall, the results failed to confirm that model-data misfit in an IRT application is related to the invariance property of IRT item/person parameter estimates. Major limitations of the study are noted, and future directions are suggested. (Contains 1 figure, 7 tables, and 15 references.) (Author/SLD)
Publication Type: Reports - Research; Speeches/Meeting Papers
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A