The main features of the ICLIFETEST procedure are as follows:
Nonparametric estimation
uses the efficient EMICM algorithm (Wellner and Zhan, 1997) to estimate survival functions by default
supports Turnbull’s algorithm (Turnbull, 1976) and the iterative convex minorant (ICM) algorithm (Groeneboom and Wellner, 1992)
computes standard errors of the survival estimates by using a multiple imputation method or a bootstrap method
supports several transformation-based confidence intervals
produces survival plots
Survival comparisons
provides the weighted generalized log-rank test
supports a variety of weight functions for testing early or late differences
supports a stratified test for survival differences within predefined populations
supports a trend test for ordered alternatives
supports multiple-comparison functionalities
The ICLIFETEST procedure uses ODS Graphics to create graphs as part of its output. For general information about ODS Graphics, see Chapter 21: Statistical Graphics Using ODS.