Capabilities

The LIFETEST Procedure

compute nonparametric estimates of the survivor function either by the product-limit method (also called the Kaplan-Meier method) or by the lifetable method (also called the actuarial method)
estimates the probability density function (life-table method )
produces the Nelson-Aalen estimates of the cumulative hazards and the corresponding standard errors
provides nonparametric k-sample tests based on weighted comparisons of the estimated hazard rate of the individual population under the null and alternative hypotheses
a variety of tests can be specified, which include the following:
- log-rank test
- Wilcoxon test
- Tarone-Ware test
- Peto-Peto test
- modified Peto-Peto test
- Fleming-Harrington G_ρ family of tests
provides corresponding trend tests to detect ordered alternatives
provides stratified tests to adjust for prognostic factors that affect the events rates in the various populations
provides a likelihood ratio test, based on an underlying exponential model to compare the survival curves of the samples
computes censored data linear rank statistics based on the exponential scores (log-rank test) and the Wilcoxon scores (Wilcoxon test)
provides five transformations to be used in the calculation of confidence limits for the quartiles of survival time
obtain separate analyses on observations in groups
uses ODS to create a SAS data set corresponding to any table
supports ODS Graphics

For further details see the SAS/STAT User's Guide: The LIFETEST Procedure
( PDF | HTML )

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