Survival Analysis Procedures

There are four SAS procedures for analyzing survival data:

• The LIFEREG procedure is a parametric regression procedure for modeling the distribution of survival time with a set of concomitant variables.

• The LIFETEST procedure 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.

• The PHREG procedure is a semiparametric procedure that fits the Cox proportional hazards model and its extensions.

• The SURVEYPHREG procedure is a Cox modeling procedure similar to PROC PHREG, appropriate for data collected from a survey sample.