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Computerization of A Under Realistic Conditions
0.5 b Value 1PL and 2PL 2PL formula 2PL value 3PL items 3PL model 3PL uniform DIF Allen & Donoghue Allen and Donoghue andfocal group mean bp b value constant across 9 contingency table correct response DIF population parameter difference in difficulty difficulty parameter display DIF examinees are matched expected value focal group mean focal group populations follow the 1PL Group b Value horizontal axis indicated 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 MH odds ratio multiple-choice item normal distribution number of examinees panels in Figure proficiency ratio of reference reference and focal reference group examinees 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