Abstract
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.
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