Graphic representation of sequential Bayesian analysis

Previously undescribed algebraic transforms of Bayes' theorem define famili es of operating points in the receiver operating characteristic (ROC) space which, at given pre-test probability, produce constant post-test probabili ties, These isopredictive operating points form straight lines in the ROC s pace. The lines can be used to emulate Bayesian sequential analysis in a st rictly graphic procedure, which can be applied in clinical work and medical education.