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A comparison of equating/linking using the Stocking-Lord method and concurrent calibration with mixed-format tests in the non-equivalent groups common-item design under IRT

Thesis advisor: Larry Ludlow / There has been a steady increase in the use of mixed-format tests, that is, tests consisting of both multiple-choice items and constructed-response items in both classroom and large-scale assessments. This calls for appropriate equating methods for such tests. As Item Response Theory (IRT) has rapidly become mainstream as the theoretical basis for measurement, different equating methods under IRT have also been developed. This study investigated the performances of two IRT equating methods using simulated data: linking following separate calibration (the Stocking-Lord method) and the concurrent calibration. The findings from this study show that the concurrent calibration method generally performs better in recovering the item parameters and more importantly, the concurrent calibration method produces more accurate estimated scores than linking following separate calibration. Limitations and directions for future research are discussed. / Thesis (PhD) — Boston College, 2011. / Submitted to: Boston College. Lynch School of Education. / Discipline: Educational Research, Measurement, and Evaluation.

Identiferoai:union.ndltd.org:BOSTON/oai:dlib.bc.edu:bc-ir_101572
Date January 2011
CreatorsTian, Feng
PublisherBoston College
Source SetsBoston College
LanguageEnglish
Detected LanguageEnglish
TypeText, thesis
Formatelectronic, application/pdf
RightsCopyright is held by the author, with all rights reserved, unless otherwise noted.

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