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stat.ME2026
Robustifying and Selecting Cohort-Appropriate Prognostic Models under Distributional Shifts
Dimitris Bertsimas, Carol Gao, Angelos G. Koulouras +1
External validation is widely regarded as the gold standard for prognostic model evaluation. In this study, we challenge the assumption that successful external calibration guarant…
stat.ME2025
Improving Survival Models in Healthcare by Balancing Imbalanced Cohorts: A Novel Approach
Catherine Ning, Dimitris Bertsimas, Johan Gagnière +11
We explore whether survival model performance in underrepresented high- and low-risk subgroups - regions of the prognostic spectrum where clinical decisions are most consequential…