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While standard clinical trials can establish whether a treatment appears to be effective on average, subsequent work is needed to determine whether there are identifiable subgroups of subjects for whom treatment is either particularly beneficial or harmful. Molecular assays and modern imaging technology now allow numerous candidate measures to be used as potential determinants of treatment choice. In this manuscript, we focus on novel measures of decision accuracy that reflect the treatment marker objective. Specifically, we define longitudinal individual\u2010level potential outcomes (principal strata) that characterize patient outcomes under treated and untreated states. 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