Literaturnachweis - Detailanzeige
Autor/in | Ackerman, Terry A. |
---|---|
Titel | An Explanation of Differential Item Functioning from a Multidimensional Perspective. |
Quelle | (1988), (30 Seiten)
PDF als Volltext |
Sprache | englisch |
Dokumenttyp | gedruckt; online; Monographie |
Schlagwörter | Achievement Tests; College Entrance Examinations; Higher Education; Item Analysis; Latent Trait Theory; Multidimensional Scaling; Standardized Tests; Test Bias; Test Construction; Test Items Achievement test; Achievement; Testing; Test; Tests; Leistungsbeurteilung; Leistungsüberprüfung; Leistung; Testdurchführung; Testen; Aufnahmeprüfung; Hochschulbildung; Hochschulsystem; Hochschulwesen; Itemanalyse; Latent-Trait-Modell; Mehrdimensionale Analysis; Standadised tests; Standardisierter Test; Testkritik; Testaufbau; Test content; Testaufgabe |
Abstract | Many researchers have suggested that the cause of differential item functioning (DIF) can in part be due to the misspecification of the supporting trait distribution (STD). This paper demonstrates how a unidimensional item response theory (IRT) calibration of response data, generated from a two-dimensional IRT model, results in DIF when the multidimensional STDs are not equal. How DIF can occur when items measure multiple ability dimensions on which groups have different STDs is illustrated. Generating item parameters used to simulate the multidimensional test were based on the American College Testing (ACT) Mathematics Usage Test administered in February 1983. The calibration sample consisted of 2,000 randomly selected students. With these item estimates as parameters, response data corresponding to three different STD conditions were generated. Results indicate that DIF, created by model misspecification, can be accurately predicted if the multidimensional IRT item parameters and the STD for the groups of interest are known. Implications and directions for future research are discussed. Five tables and four graphs present study data. (Author/SLD) |
Erfasst von | ERIC (Education Resources Information Center), Washington, DC |