Literaturnachweis - Detailanzeige
Autor/in | Nandakumar, Ratna |
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Titel | Development of a Valid Subtest for Assessment of DIF/Bias. |
Quelle | (1994), (25 Seiten)
PDF als Volltext |
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 |
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 |