A Generalized DIF Effect Variance Estimator for Measuring Unsigned Differential Test Functioning in Mixed Format Tests

Autor/inn/en	Penfield, Randall D.; Algina, James
Titel	A Generalized DIF Effect Variance Estimator for Measuring Unsigned Differential Test Functioning in Mixed Format Tests
Quelle	In: Journal of Educational Measurement, 43 (2006) 4, S.295-312 (18 Seiten)Infoseite zur Zeitschrift PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0022-0655
DOI	10.1111/j.1745-3984.2006.00018.x
Schlagwörter	Test Bias; Test Format; Test Items; Simulation; Guidelines + Suchen Sie Ihr Suchwort? Testkritik; Testentwicklung; Test content; Testaufgabe; Simulation program; Simulationsprogramm; Richtlinien
Abstract	One approach to measuring unsigned differential test functioning is to estimate the variance of the differential item functioning (DIF) effect across the items of the test. This article proposes two estimators of the DIF effect variance for tests containing dichotomous and polytomous items. The proposed estimators are direct extensions of the noniterative estimators developed by Camilli and Penfield (1997) for tests composed of dichotomous items. A small simulation study is reported in which the statistical properties of the generalized variance estimators are assessed, and guidelines are proposed for interpreting values of DIF effect variance estimators. (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