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ERIC Number: ED408306
Record Type: Non-Journal
Publication Date: 1997-Mar
Pages: 34
Abstractor: N/A
Reference Count: N/A
A Comparison of Linking and Concurrent Calibration under the Graded Response Model.
Kim, Seock-Ho; Cohen, Allan S.
Applications of item response theory to practical testing problems including equating, differential item functioning, and computerized adaptive testing, require that item parameter estimates be placed onto a common metric. In this study, two methods for developing a common metric for the graded response model under item response theory were compared: (1) linking separate calibration runs using equating coefficients from the characteristic curve method; and (2) concurrent calibration using the combined data of the base and target groups. Concurrent calibration yielded consistently albeit only slightly smaller root mean square differences for both item discrimination and location parameters. Similar results were observed for Euclidean distances between estimates and parameters. (Contains 2 figures, 6 tables, and 24 references.) (Author)
Publication Type: Reports - Evaluative; Speeches/Meeting Papers
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A