ERIC Number: ED424238
Record Type: Non-Journal
Publication Date: 1996-Oct
Reference Count: N/A
Appropriateness of IRT Observed Score Equating. Research Report 96-04.
Glas, Cees A. W.; Beguin, Anton A.
Recently, L. Zeng and M. J. Kolen (1995) have introduced item response theory (IRT) observed score (OS) equating of number-correct (NC) scores for equating different forms of a test. In this paper, IRT-OS-NC equating is adapted to equating the cut-off scores of examinations. Next, the differences between results obtained using a Rasch model for polytomously scored items and results obtained via the nominal response model are evaluated. For both versions of IRT-OS-NC equating confidence intervals are derived. Finally, two procedures for testing the validity of the procedure are presented. Differences between the two versions were not very large. The methods studied here are exemplified with the results of equating a number of the examinations in secondary education in the Netherlands. Some limitations of the approach are discussed. (Contains one figure and seven tables.) (Author/SLD)
Descriptors: Achievement Tests, Cutting Scores, Equated Scores, Foreign Countries, Item Response Theory, Scoring, Secondary Education, Secondary School Students, Test Format, Test Results
Faculty of Educational Science and Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.
Publication Type: Reports - Evaluative
Education Level: N/A
Authoring Institution: Twente Univ., Enschede (Netherlands). Faculty of Educational Science and Technology.
Identifiers - Location: Netherlands