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ability estimate ability group active test Analytical Reasoning answer key associated characteristic curve chosen Computerized Adaptive Testing computerized LSAT conventional CAT cost coefficient decision variable deviation limit discrete items equated examinee's ability examinee's trait level example exposure control exposure rates forced routing fraction item pool Lagrangian relaxation large number Law School Admission Logical Reasoning LR section LSAC mean squared error MFS approach MFS assembly MFSD multiple form structure multiple testlets normal distribution number of bins number of correct number of items number of testlets objective function omniscient test simulation P&P test parallel MFSs parameters percentile group population pretest RC sections Reading Comprehension root mean squared routing rules scaled score School Admission Council set and target shadow CAT simulated examinees specific target curves target information function test form test specialists testing program testlet pool Testlets assigned true ability TTIFs and TTCCs usage word count