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ERIC Number: EJ777478
Record Type: Journal
Publication Date: 2007
Pages: 21
Abstractor: Author
Reference Count: 18
ISSN: ISSN-0146-6216
Bias of Exploratory and Cross-Validated DETECT Index under Unidimensionality
Monahan, Patrick O.; Stump, Timothy E.; Finch, Holmes; Hambleton, Ronald K.
Applied Psychological Measurement, v31 n6 p483-503 2007
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.]
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Publication Type: Journal Articles; Reports - Evaluative
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A