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Deng, H., & Ansley, T.. (2003). To stratify or not: An investigation of CAT item selection procedures under practical constraints. In Paper presented at the Annual meeting of the National Council on Measurement in Education. Chicago IL.
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Deng, H., & Chang, H. - H.. (2001). a-stratified computerized adaptive testing with unequal item exposure across strata. In Paper presented at the annual meeting of the American Educational Research Association. Seattle WA.