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ERIC Number: EJ878842
Record Type: Journal
Publication Date: 2010-Mar
Pages: 20
Abstractor: As Provided
Reference Count: 34
ISBN: N/A
ISSN: ISSN-0033-3123
Statistical Tests of Conditional Independence between Responses and/or Response Times on Test Items
van der Linden, Wim J.; Glas, Cees A. W.
Psychometrika, v75 n1 p120-139 Mar 2010
Three plausible assumptions of conditional independence in a hierarchical model for responses and response times on test items are identified. For each of the assumptions, a Lagrange multiplier test of the null hypothesis of conditional independence against a parametric alternative is derived. The tests have closed-form statistics that are easy to calculate from the standard estimates of the person parameters in the model. In addition, simple closed-form estimators of the parameters under the alternatives of conditional dependence are presented, which can be used to explore model modification. The tests were applied to a data set from a large-scale computerized exam and showed excellent power to detect even minor violations of conditional independence. (Contains 6 figures.)
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A