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ERIC Number: EJ829939
Record Type: Journal
Publication Date: 2009-Mar
Pages: 19
Abstractor: As Provided
Reference Count: 0
ISSN: ISSN-0033-3123
A New Concurrent Calibration Method for Nonequivalent Group Design under Nonrandom Assignment
Miyazaki, Kei; Hoshino, Takahiro; Mayekawa, Shin-ichi; Shigemasu, Kazuo
Psychometrika, v74 n1 p1-19 Mar 2009
This study proposes a new item parameter linking method for the common-item nonequivalent groups design in item response theory (IRT). Previous studies assumed that examinees are randomly assigned to either test form. However, examinees can frequently select their own test forms and tests often differ according to examinees' abilities. In such cases, concurrent calibration or multiple group IRT modeling without modeling test form selection behavior can yield severely biased results. We proposed a model wherein test form selection behavior depends on test scores and used a Monte Carlo expectation maximization (MCEM) algorithm. This method provided adequate estimates of testing parameters.
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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