PROC LIFETEST
<options> ;
The PROC LIFETEST statement invokes the LIFETEST procedure. Optionally, this statement identifies an input data set and an output data set, and specifies the computation details of the survivor function estimation. Table 56.1 summarizes the options available in the PROC LIFETEST statement. These options are described in alphabetic order.
ODS Graphics is the preferred method of creating graphs. Many new features have been added to the ODS Graphics plots. For example, you can display the number of subjects at risk in a survival plot. For information about ODS Graphics options, see the PLOTS= option.
If no plotting options are specified, PROC LIFETEST displays a table that shows the productlimit estimate of the survivor function. If ODS Graphics is enabled, PROC LIFETEST also displays a plot of the estimated survivor function. Other options for displaying the estimated survivor function are documented in the section Plot Options Superseded by ODS Graphics.
Table 56.1: Options Available in the PROC LIFETEST Statement
Option 
Description 

Input and Output Data Sets 

Specifies the input SAS data set 

Names an output data set to contain survival estimates and confidence limits 

Names an output data set to contain rank test statistics for association of survival time with covariates 

Nonparametric Estimation 

Specifies interval endpoints for lifetable estimates 

Adds the NelsonAalen estimates 

Specifies the method to compute survivor function 

Specifies the number of intervals for lifetable estimates 

Specifies the width of intervals for lifetable estimates 

Confidence Limits for Survivorship 

Sets the confidence level for interval estimation estimates 

Specifies the maximum time for confidence band 

Specifies the minimum time for confidence band 

Specifies the type of confidence band in the OUTSURV= data set 

Specifies the transformation applied to the survivor function to obtain confidence limits 

ODS Graphics 

Specifies the maximum time value for plotting 

Specifies plots to display 

Control Output 

Adds the number of subjects at risk to the survival estimate table 

Suppresses the display of printed output 

Suppresses the display of survival function estimates 

Displays only the estimate for the smallest time in each interval 

Suppresses the Number Left column in the survival estimate table 

Specifies a list of time points to display the survival estimate 

Specifies that only INTERVAL= or TIMELIST= observations be listed in the OUTSURV= data set 

Miscellaneous 

Sets the confidence level for survival time quartiles 

Allows missing values to be a stratum level 

Sets the tolerance for testing singularity of covariance matrix of rank statistics 

Outputs the standard error for the survival estimators to the OUTSURV= data set 

Specifies the time limit used to estimate the mean survival time and its standard error 