Development of a Valid Subtest for Assessment of DIF/Bias.

Autor/in	Nandakumar, Ratna
Titel	Development of a Valid Subtest for Assessment of DIF/Bias.
Quelle	(1994), (25 Seiten) PDF als Volltext kostenfreie Datei Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Monographie
Schlagwörter	Ability; Computer Simulation; Construct Validity; Educational Assessment; Equal Education; Item Bias; Research Methodology; Test Construction; Test Items; Test Results + Suchen Sie Ihr Suchwort? Fähigkeit; Fertigkeit; Computergrafik; Computersimulation; Education; assessment; Bewertungssystem; Research method; Forschungsmethode; Testaufbau; Test content; Testaufgabe
Abstract	By definition, differential item functioning (DIF) refers to unequal probabilities of a correct response to a test item by examinees from two groups when controlled for their ability differences. Simulation results are presented for an attempt to purify a test by separating out multidimensional items under the assumption that the intent of the test constructors was to construct a unidimensional test for a given population. The procedure used to arrive at the purified and essentially unidimensional subtest used the multidimensional theory of DIF/bias proposed by Shealy and Stout (1993) and the statistical procedure DIMTEST for assessing essential unidimensionality. When applicable, the proposed methodology leads to a statistically validated construct valid subtest that can be used in the matching criterion for DIF/bias analysis. This methodology can be applied to an internal or external matching criterion. It is only applicable when the majority of test items are tapping the intended ability for a given population, while a few items are tapping other major abilities in addition to the intended ability. This method is not applicable when DIF/bias is pervasive. Ten tables summarize analysis results. (Contains 28 references.) (SLD)
Erfasst von	ERIC (Education Resources Information Center), Washington, DC