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Walker, C. M., & Ackerman, T. A.. (1999). An examination of conditioning variables in DIF analysis in a computer adaptive testing environment. In Paper presented at the annual meeting of the National Council on Measurement in Education. Montreal, Canada.
Ackerman, T. A. (1987). The use of unidimensional item parameter estimates of multidimensional items in adaptive testing (No. 87-13). ACT Research Reports (p. 33). presented at the September, 1987, Iowa City, IA: ACT.