Survival Analysis Procedures

There are three SAS procedures for analyzing survival data: LIFEREG, LIFETEST, and PHREG. PROC LIFEREG is a parametric regression procedure for modeling the distribution of survival time with a set of concomitant variables. PROC LIFETEST is a nonparametric procedure for estimating the survivor function, comparing the underlying survival curves of two or more samples, and testing the association of survival time with other variables. PROC PHREG is a semiparametric procedure that fits the Cox proportional hazards model and its extensions.