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ERIC Number: EJ1047484
Record Type: Journal
Publication Date: 2014
Pages: 19
Abstractor: As Provided
ISSN: ISSN-0022-0655
A Comparison of Different Psychometric Approaches to Modeling Testlet Structures: An Example with C-Tests
Schroeders, Ulrich; Robitzsch, Alexander; Schipolowski, Stefan
Journal of Educational Measurement, v51 n4 p400-418 Win 2014
C-tests are a specific variant of cloze tests that are considered time-efficient, valid indicators of general language proficiency. They are commonly analyzed with models of item response theory assuming local item independence. In this article we estimated local interdependencies for 12 C-tests and compared the changes in item difficulties, reliability estimates, and person parameter estimates for different modeling approaches: (a) Rasch, (b) testlet, (c) partial credit, and (d) copula models. The results are complemented with findings of a simulation study in which sample size, number of testlets, and strength of residual correlations between items were systematically manipulated. Results are discussed with regard to the pivotal question whether residual dependencies between items are an artifact or part of the construct.
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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
Grant or Contract Numbers: N/A