Location Indices for Ordinal Polytomous Items Based on Item Response Theory. Research Report. ETS RR-15-20

Autor/inn/en	Ali, Usama S.; Chang, Hua-Hua; Anderson, Carolyn J.
Titel	Location Indices for Ordinal Polytomous Items Based on Item Response Theory. Research Report. ETS RR-15-20
Quelle	In: ETS Research Report Series, (2015), (15 Seiten)Infoseite zur Zeitschrift PDF als Volltext kostenfreie Datei Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	2330-8516
Schlagwörter	Item Response Theory; Test Items; Computer Assisted Testing; Adaptive Testing + Suchen Sie Ihr Suchwort? Item-Response-Theorie; Test content; Testaufgabe
Abstract	Polytomous items are typically described by multiple category-related parameters; situations, however, arise in which a single index is needed to describe an item's location along a latent trait continuum. Situations in which a single index would be needed include item selection in computerized adaptive testing or test assembly. Therefore single location indices for ordinal polytomous items are proposed and studied. The proposed location indices (LIs) for polytomous items are mathematically derived based on the item category response functions (ICRFs) and item response function (IRF) for polytomous items. The ICRF approach resulted in three indices: LI[subscript mean], LI[subscript trimmed mean], and LI[subscript median], and the IRF approach resulted in one proposed index, LI[subscript IRF]. An empirical example of real items is presented to help comprehension of the new location indices. Possible testing applications where the proposed item location indices are useful are discussed. (As Provided).
Anmerkungen	Educational Testing Service. Rosedale Road, MS19-R Princeton, NJ 08541. Tel: 609-921-9000; Fax: 609-734-5410; e-mail: RDweb@ets.org; Web site: https://www.ets.org/research/policy_research_reports/ets
Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2020/1/01