Introduction to Survival Analysis Procedures

Nonparametric Methods for Interval-Censored Data: The ICLIFETEST Procedure

The ICLIFETEST procedure computes nonparametric estimates of the survival functions and examines the equality of the survival functions via statistical tests. PROC ICLIFETEST is intended primarily for handling interval-censored data, whereas the LIFETEST procedure deals exclusively with right-censored data. You can use PROC ICLIFETEST to analyze data that are left-censored, interval-censored, or right-censored. However, if the data to be analyzed contain only exact or right-censored observations, it is recommended that PROC LIFETEST be used because it provides specialized methods for dealing with right-censored data. For more information about PROC ICLIFETEST, see ChapterĀ 50: The ICLIFETEST Procedure.