Application of the Bi-Factor Multidimensional Item Response Theory Model to Testlet-Based Tests

Autor/in	DeMars, Christine E.
Titel	Application of the Bi-Factor Multidimensional Item Response Theory Model to Testlet-Based Tests
Quelle	In: Journal of Educational Measurement, 43 (2006) 2, S.145-168 (24 Seiten)Infoseite zur Zeitschrift PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0022-0655
DOI	10.1111/j.1745-3984.2006.00010.x
Schlagwörter	Item Response Theory; Reliability; Item Analysis; Factor Analysis; Difficulty Level; Test Items; Tests; Models; Scores; Comparative Analysis + Suchen Sie Ihr Suchwort? Item-Response-Theorie; Reliabilität; Itemanalyse; Faktorenanalyse; Schwierigkeitsgrad; Test content; Testaufgabe; Examination; Prüfung; Examen; Analogiemodell
Abstract	Four item response theory (IRT) models were compared using data from tests where multiple items were grouped into testlets focused on a common stimulus. In the bi-factor model each item was treated as a function of a primary trait plus a nuisance trait due to the testlet; in the testlet-effects model the slopes in the direction of the testlet traits were constrained within each testlet to be proportional to the slope in the direction of the primary trait; in the polytomous model the item scores were summed into a single score for each testlet; and in the independent-items model the testlet structure was ignored. Using the simulated data, reliability was overestimated somewhat by the independent-items model when the items were not independent within testlets. Under these nonindependent conditions, the independent-items model also yielded greater root mean square error (RMSE) for item difficulty and underestimated the item slopes. When the items within testlets were instead generated to be independent, the bi-factor model yielded somewhat higher RMSE in difficulty and slope. Similar differences between the models were illustrated with real data. (Author).
Anmerkungen	Blackwell Publishing. 350 Main Street, Malden, MA 02148. Tel: 800-835-6770; Tel: 781-388-8599; Fax: 781-388-8232; e-mail: customerservices@blackwellpublishing.com; Web site: http://www.blackwellpublishing.com/jnl_default.asp.
Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2017/4/10