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Theses/Dissertations

University of Iowa

Equating

2017

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Irt Linking Methods For The Bifactor Model: A Special Case Of The Two-Tier Item Factor Analysis Model, Kyung Yong Kim Aug 2017

Irt Linking Methods For The Bifactor Model: A Special Case Of The Two-Tier Item Factor Analysis Model, Kyung Yong Kim

Theses and Dissertations

For unidimensional item response theory (UIRT) models, three linking methods, which are the separate, concurrent, and fixed parameter calibration methods, have been developed and widely used in applications such as vertical scaling, differential item functioning, computerized adaptive testing (CAT), and equating. By contrast, even though a few studies have compared the separate and concurrent calibration methods for full multidimensional IRT (MIRT) models or applied the concurrent calibration method to vertical scaling using the bifactor model, no study has yet provided technical descriptions of the concurrent and fixed parameter calibration methods for any MIRT models. Thus, the purpose of this dissertation ...