A Comparison of Alternative Models for Testlets

Autor/inn/en	Li, Yanmei; Bolt, Daniel M.; Fu, Jianbin
Titel	A Comparison of Alternative Models for Testlets
Quelle	In: Applied Psychological Measurement, 30 (2006) 1, S.3-21 (19 Seiten) PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0146-6216
DOI	10.1177/0146621605275414
Schlagwörter	Models; Markov Processes; Item Response Theory; Tests; Monte Carlo Methods; Evaluation Methods + Suchen Sie Ihr Suchwort? Analogiemodell; Markowscher Prozess; Item-Response-Theorie; Examination; Prüfung; Examen; Monte-Carlo-Methode
Abstract	When tests are made up of testlets, standard item response theory (IRT) models are often not appropriate due to the local dependence present among items within a common testlet. A testlet-based IRT model has recently been developed to model examinees' responses under such conditions (Bradlow, Wainer, & Wang, 1999). The Bradlow, Wainer, and Wang model introduces separate testlet factors to account for this dependence and applies a common item discrimination parameter to both the general ability and testlet factor. This study investigates several alternative ways of accounting for local dependence that make different assumptions regarding the influence of testlet factors on item performance. The authors implement several Bayesian model selection criteria to compare models using several real test data sets that have a testlet structure. Results suggest that an alternative model in which separate discrimination parameters are applied to the general ability and testlet factors provides a better fit to these data despite its greater complexity. (Author).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2017/4/10