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IRT Equating Methods
Author(s) -
Cook Linda L.,
Eignor Daniel R.
Publication year - 1991
Publication title -
educational measurement: issues and practice
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.158
H-Index - 52
eISSN - 1745-3992
pISSN - 0731-1745
DOI - 10.1111/j.1745-3992.1991.tb00207.x
Subject(s) - equating , item response theory , context (archaeology) , calibration , econometrics , computer science , scale (ratio) , statistics , mathematics , psychometrics , rasch model , geography , cartography , archaeology
The purpose of this instructional module is to provide the basis for understanding the process of score equating through the use of item response theory (IRT). A context is provided for addressing the merits of IRT equating methods. The mechanics of IRT equating and the need to place parameter estimates from separate calibration runs on the same scale are discussed. Some procedures for placing parameter estimates on a common scale are presented. In addition, IRT true‐score equating is discussed in some detail. A discussion of the practical advantages derived from IRT equating is offered at the end of the module.