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Item response theory applied to combinations of multiple-choice and constructed-response items--approximation methods for scale scores. In Test scoring (pp. 289-315). Mahwah, N.J. USA: Lawrence Erlbaum Associates.
. (2001). Computerized adaptive testing with the generalized graded unfolding model. Applied Psychological Measurement, 25, 177-196.
. (2001). An EM approach to parameter estimation for the Zinnes and Griggs paired comparison IRT model. Applied Psychological Measurement, 26, 208-227.
. (2002). Outlier detection in high-stakes certification testing. Journal of Educational Measurement, 39, 219-233.
. (2002).