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3-PL model 40 1 cutting 40 1 sequential 40 fixed test ability parameter adaptive mastery testing applied Bayesian sequential approach ASMT conditions ASMT procedures backward induction Bayesian decision theory Bayesian sequential decision binomial distribution Bradlow computed cut-off point 0C cutting point 26 decision-theoretic Decisions Mean Loss eap estimate eap estimate 38 expected loss associated expected risk fixed test 1.00 fixed-length mastery problem framework Given Decisions Mean ignoring the testlet IRT model item difficulties item or testlet item response theory item selection strategies Lewis and Sheehan loss function mastery or nonmastery multivariate normal distribution number of items number of simulation number of testlets posterior expected loss prior distribution Rasch model risk of continuing sequential decision theory sequential mastery testing simulation studies stage of sampling standard normal distribution stopping rule testee's ability level testlet structure Testlets Correct Testlets theory to AMT type of variable-length variable-length mastery problem variable-length mastery testing Wainer