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Simultaneous DIF Amplification and Cancellation: Shealy‐Stout's Test for DIF
Author(s) -
Nandakumar Ratna
Publication year - 1993
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.1745-3984.1993.tb00428.x
Subject(s) - test (biology) , test data , variety (cybernetics) , computer science , statistics , item response theory , mathematics , psychology , psychometrics , paleontology , biology , programming language
The present study investigates the phenomena of simultaneous DIF amplification and cancellation and SIBTEST's role in detecting such. A variety of simulated test data were generated for this purpose. In addition, real test data from various sources were analyzed. The results from both simulated and real test data, as Sheafy and Stout's theory (1993a, 1993b) suggests, show that the SIBTEST is effective in assessing DIF amplification and cancellation (partially or fully) at the test score level. Finally, methodological and substantive implications of DIF amplification and cancellation are discussed.