Equating Test Forms Composed of Testlets Using Dichotomous and Polytomous IRT Models.

Autor/inn/en	Lee, Guemin; Kolen, Michael J.; Frisbie, David A.; Ankenmann, Robert D.
Titel	Equating Test Forms Composed of Testlets Using Dichotomous and Polytomous IRT Models.
Quelle	(1998), (42 Seiten) PDF als Volltext kostenfreie Datei Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Monographie
Schlagwörter	Equated Scores; Item Response Theory; Robustness (Statistics); Tables (Data); Test Items + Suchen Sie Ihr Suchwort? Item-Response-Theorie; Widerstandsfähigkeit; Tabelle; Test content; Testaufgabe
Abstract	Item response models can be applied in many test equating situations by making strong statistical assumptions. Thus, studying the robustness of the models to violations of the assumptions and investigating model-data fit are essential in all item response theory (IRT) equating applications (M. Kolen and R. Brennan, 1995). Previous studies dealing with tests composed of testlets have indicated that the assumptions of the dichotomous IRT models are frequently violated; however, passage scores can be used instead of item scores to eliminate the effect of the dependence among within-passage items (G. Lee and D. Frisbie, 1997; H. Wainer and D. Thissen, 1996; S. Sireci, D. Thissen, and H. Wainer, 1991). The purpose of this study was to compare the performance of polytomous IRT models to that of the dichotomous three-parameter logistic model in the context of equating test forms composed of testlets, using traditional equating methods as criteria for both. For equating test forms composed of testlets, equating methods based on polytomous IRT models were found to produce results that more closely agreed with the results from traditional methods than did equating methods based on the dichotomous three-parameter logistic IRT model. (Contains 7 tables, 10 figures, and 32 references.) (Author/SLD)
Erfasst von	ERIC (Education Resources Information Center), Washington, DC