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50,000 simulated test a's for stage ability distribution adapts item difficulty administered three randomly Bayes modal score Bayes sequential scoring bias bias statistic common stimulus computerized adaptive test computerized LSAT difficulty to test error MSE flat distribution Hambleton high stage-two testlets highest information items administered Law School Admission less error level of stage LSAC maximum-information item-level design maximum-information testlet-based design mean squared error multistage designs multistage test multistage testlet design nonpsychometric normal distribution Owen's Bayes sequential Paper & Pencil paper-and-pencil test precision of ability provide a solution psychometric right score RMSE root mean squared roughly adapted routing test School Admission Council simulated test takers Stage 2 mean stage-one number stage-one number-right score stage-two levels stage/level standard CAT design standard maximum-information item-level standard normal Swaminathan test designs test taker ability test taker's estimated test-score users testlet centered testlet information Testlet Stage testlets bundles two-stage and multistage two-stage design two-stage testlet design