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Development and Demonstration of Multidimensional IRT‐Based Internal Measures of Differential Functioning of ltems and Tests
Author(s) -
Oshima T. C.,
Raju Nambury S.,
Flowers Claudia P.
Publication year - 1997
Publication title -
journal of educational measurement
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.917
H-Index - 47
eISSN - 1745-3984
pISSN - 0022-0655
DOI - 10.1111/j.1745-3984.1997.tb00518.x
Subject(s) - differential item functioning , item response theory , differential (mechanical device) , psychometrics , psychology , multidimensional scaling , item analysis , test (biology) , scale (ratio) , statistics , mathematics , developmental psychology , paleontology , physics , quantum mechanics , engineering , biology , aerospace engineering
This article defines and demonstrates a framework for studying differential item functioning (DIF) and differential test functioning (DTF) for tests that are intended to be multidimensional The procedure introduced here is an extension of unidimensional differential functioning of items and tests (DFIT) recently developed by Raju, van der Linden, & Fleer (1995). To demonstrate the usefulness of these new indexes in a multidimensional IRT setting, two‐dimensional data were simulated with known item parameters and known DIF and DTE The DIF and DTF indexes were recovered reasonably well under various distributional differences of Os after multidimensional linking was applied to put the two sets of item parameters on a common scale. Further studies are suggested in the area of DIF/DTF for intentionally multidimensional tests.