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Computerization of A Under Realistic Conditions
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1.5 b Value 1PL and 2PL 1PL or 2PL 2PL value 3PL DIF item 3PL items 3PL model Allen & Donoghue Allen and Donoghue bp b value calculated constant across 9 contingency table correct response DIF population parameter difference in difficulty differential item functioning difficulty parameter display DIF focal group mean focal group populations focal mean follow the 3PL formulation group's 9's horizontal axis item correctly Item Response Theory Law School Admission lower asymptote LSAT matched on ability matching on 9 matching on total mean-value theorem MH DIF estimator MH DIF parameter MH DIF population MH DIF statistic multiple-choice items normal distribution number of examinees panels in Figure proficiency ratio of reference reference and focal research report School Admission Council score level shown in Panel specified as following standard deviation statistical bias studied item total test score Type I error Value of Focal value of reference varies across panels various values