For Gaussian designs, the ridge-penalized piecewise exponential survival model has an asymptotically exact scalar surrogate whose saddle point predicts the estimator and test error.
Cox’s regression model for counting processes: A large sample study
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Proportional asymptotics of piecewise exponential proportional hazards models
For Gaussian designs, the ridge-penalized piecewise exponential survival model has an asymptotically exact scalar surrogate whose saddle point predicts the estimator and test error.