Bias of Exploratory and Cross-Validated DETECT Index under Unidimensionality

Autor/inn/en	Monahan, Patrick O.; Stump, Timothy E.; Finch, Holmes; Hambleton, Ronald K.
Titel	Bias of Exploratory and Cross-Validated DETECT Index under Unidimensionality
Quelle	In: Applied Psychological Measurement, 31 (2007) 6, S.483-503 (21 Seiten) PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0146-6216
DOI	10.1177/0146621606292216
Schlagwörter	Test Length; Sample Size; Monte Carlo Methods; Geometric Concepts; Item Response Theory; Statistical Bias; Hypothesis Testing; Multidimensional Scaling + Suchen Sie Ihr Suchwort? Monte-Carlo-Methode; Elementare Geometrie; Item-Response-Theorie; Hypothesenprüfung; Hypothesentest; Mehrdimensionale Analysis
Abstract	DETECT is a nonparametric "full" dimensionality assessment procedure that clusters dichotomously scored items into dimensions and provides a DETECT index of magnitude of multidimensionality. Four factors (test length, sample size, item response theory [IRT] model, and DETECT index) were manipulated in a Monte Carlo study of bias, standard error, and root mean square error (RMSE) under the condition of unidimensionality. Bias, standard error, and RMSE of both DETECT indices increased as test length and sample size decreased. Results suggest that the cross-validated index should always be preferred over the exploratory index, even for 100 examinees and five items. Bias, standard error, and RMSE may be problematic for both indices under certain conditions of small samples or short tests. A Monte Carlo procedure could be built into DETECT to estimate and adjust for potential bias. (Contains 7 tables and 3 figures.) [This research was supported by grants from the Mary Margaret Walther Program for Cancer Care Research. This article is a revision of a paper presented at the annual meeting of the National Council on Measurement in Education, Montreal, April 14, 2005.] (Author).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2017/4/10