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Raju's Differential Functioning of Items and Tests (DFIT)
Author(s) -
Oshima T. C.,
Morris S. B.
Publication year - 2008
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.1745-3992.2008.00127.x
Subject(s) - differential item functioning , variety (cybernetics) , differential (mechanical device) , psychometrics , item response theory , psychology , computer science , cognitive psychology , artificial intelligence , developmental psychology , physics , thermodynamics
Nambury S. Raju (1937–2005) developed two model‐based indices for differential item functioning (DIF) during his prolific career in psychometrics. Both methods, Raju's area measures ( Raju, 1988 ) and Raju's DFIT ( Raju, van der Linden, & Fleer, 1995 ), are based on quantifying the gap between item characteristic functions (ICFs). This approach provides an intuitive and flexible methodology for assessing DIF. The purpose of this tutorial is to explain DFIT and show how this methodology can be utilized in a variety of DIF applications.