Under proportional hazards, the true model's expected concordance gives a tight upper bound for any model's C-Index, and kidney transplant data show a bound near 0.75 with substantial ethnic differences in achieved concordance.
Probast: a tool to assess the risk of bias and applicability of prediction model studies
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Equitable Discrimination in Survival Prediction: The Maximum Expected C-Index
Under proportional hazards, the true model's expected concordance gives a tight upper bound for any model's C-Index, and kidney transplant data show a bound near 0.75 with substantial ethnic differences in achieved concordance.