A Unified Approach to IRT Scale Linking and Scale Transformations. Research Report. RR-04-09

Autor/inn/en	von Davier, Matthias; von Davier, Alina A.
Institution	Educational Testing Service, Princeton, NJ.
Titel	A Unified Approach to IRT Scale Linking and Scale Transformations. Research Report. RR-04-09
Quelle	(2004), (27 Seiten) PDF als Volltext kostenfreie Datei Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Monographie
Schlagwörter	Measures (Individuals); Item Response Theory; Item Analysis; Models; Psychometrics; Data Collection; Test Items; Testing + Suchen Sie Ihr Suchwort? Messdaten; Item-Response-Theorie; Itemanalyse; Analogiemodell; Psychometry; Psychometrie; Data capture; Datensammlung; Test content; Testaufgabe; Testdurchführung; Testen
Abstract	This paper examines item response theory (IRT) scale transformations and IRT scale linking methods used in the Non-Equivalent Groups with Anchor Test (NEAT) design to equate two tests, X and Y. It proposes a unifying approach to the commonly used IRT linking methods: mean-mean, mean-var linking, concurrent calibration, Stocking and Lord and Haebara characteristic curves approaches, and fixed-item parameters scale linkage. The main idea is to view any linking procedure as a restriction on the item parameter space. Then a rewriting of the log-likelihood function together with an appropriately implemented maximization procedure of the log-likelihood function under linear (or nonlinear restrictions) will accomplish the linking. The proposed method is general enough to cover both the dichotomous item response models (the one parameter logistic (1PL) model, 2PL, and 3PL) and the polytomous unidimensional IRT models like the generalized partial credit model. (Contains 1 note.) (Author).
Anmerkungen	Educational Testing Service. Rosedale Road Mailstop 19R, Princeton, NJ 08541-0001. Tel: 609-921-9000; Fax: 609-734-5410; Web site: http://www.ets.org.
Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2017/4/10