Effects of Multidimensionality on IRT Item Characteristics and True Score Estimates: Implications for Computerized Test Assembly. Computerized Testing Report. LSAC Research Report Series.

Autor/inn/en	Wang, Xiang-Bo; Harris, Vincent; Roussos, Louis
Institution	Law School Admission Council, Newtown, PA.
Titel	Effects of Multidimensionality on IRT Item Characteristics and True Score Estimates: Implications for Computerized Test Assembly. Computerized Testing Report. LSAC Research Report Series.
Quelle	(2002), (23 Seiten) PDF als Volltext kostenfreie Datei Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Monographie
Schlagwörter	Quantitative Daten; Ability; College Entrance Examinations; Computer Assisted Testing; Estimation (Mathematics); Item Response Theory; Law Schools; Test Construction; Test Items; True Scores; Law School Admission Test + Suchen Sie Ihr Suchwort? Fähigkeit; Fertigkeit; Aufnahmeprüfung; Estimation; Mathematics; Schätzung; Item-Response-Theorie; Testaufbau; Test content; Testaufgabe; Law school; Assessment; Admission criteria; Admission procedures; Rechtswissenschaft; Fachbereich; Eignungsprüfung; Eignungstest; Hochschulzulassung
Abstract	Multidimensionality is known to affect the accuracy of item parameter and ability estimations, which subsequently influences the computation of item characteristic curves (ICCs) and true scores. By judiciously combining sections of a Law School Admission Test (LSAT), 11 sections of varying degrees of uni- and multidimensional structures are used to assess the impact of multidimensionality on ICCs and true scores. This combination makes an artificial test for analysis purposes. It was found that multidimensionality decreased item slopes and estimated true score curves. The effect is shown to be bigger in the high ability range than in the low ability range. (Contains 23 figures and 21 references.) (Author/SLD)
Erfasst von	ERIC (Education Resources Information Center), Washington, DC