Survival, Cox Regression, Kaplan Meier, Weibull Distribution, Accelerated Failure Time.
martingale residuals. You should see NO structure! If you do, you need to add polynomial effects or splines to model the continuous covariates. No structure found so a linear-form inclusion seems to be fine. In PROC PHREG, there is also the ASSES procedure. This is a more statistical procedure and