An Extension of IRT-Based Equating to the Dichotomous Testlet Response Theory Model

Autor/inn/en	Tao, Wei; Cao, Yi
Titel	An Extension of IRT-Based Equating to the Dichotomous Testlet Response Theory Model
Quelle	In: Applied Measurement in Education, 29 (2016) 2, S.108-121 (14 Seiten)Infoseite zur Zeitschrift PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0895-7347
DOI	10.1080/08957347.2016.1138956
Schlagwörter	Item Response Theory; Equated Scores; Test Format; Models; Test Theory; True Scores; Error of Measurement; Bias + Suchen Sie Ihr Suchwort? Item-Response-Theorie; Testentwicklung; Analogiemodell; Testtheorie; Messfehler
Abstract	Current procedures for equating number-correct scores using traditional item response theory (IRT) methods assume local independence. However, when tests are constructed using testlets, one concern is the violation of the local item independence assumption. The testlet response theory (TRT) model is one way to accommodate local item dependence. This study proposes methods to extend IRT true score and observed score equating methods to the dichotomous TRT model. We also examine the impact of local item dependence on equating number-correct scores when a traditional IRT model is applied. Results of the study indicate that when local item dependence is at a low level, using the three-parameter logistic model does not substantially affect number-correct equating. However, when local item dependence is at a moderate or high level, using the three-parameter logistic model generates larger equating bias and standard errors of equating compared to the TRT model. However, observed score equating is more robust to the violation of the local item independence assumption than is true score equating. (As Provided).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2020/1/01