Producing High-Quality Figures Using SAS/GRAPH and ODS Graphics Procedures

195

11

Survival Plots

11.1 Introduction

Survival data refer to observations of subjects after intervention and over

a certain length of time (even lifetime) until the occurrence of an event.

In clinical research, an event can be the time from treatment to death in

cancer research, the time from treatment in a bone fracture in osteoporosis

clinical trials, and so on. PROC LIFETEST, one of the survival analysis pro-

cedures in SAS/STAT, computes the Kaplan–Meier estimates of the survival

functions and compares survival plots (curves) between different treatment

groups (Kuhfeld and So, 2013). The log-rank test is usually used to analyze

the intervention ...