These macros compute nonparametric survival curve estimates from interval-censored data. Confidence intervals for survival curves and log-rank tests comparing survival curves from several groups are also provided. NOTE: Beginning with SAS/STAT 13.1 in SAS 9.4 TS1M1, the functionality of these macros has been updated and added to the ICLIFETEST procedure. For details, see the ICLIFETEST documentation. PURPOSE: These macros compute nonparametric maximum likelihood estimates (NPMLEs) of survival curves from interval-censored data. Confidence intervals for survival curves and log-rank tests comparing survival curves from several groups are also provided.