The LIFETEST Procedure 
ODS Graphics 
To request graphics with PROC LIFETEST, you must first enable ODS Graphics by specifying the ods graphics on statement. See Chapter 21, Statistical Graphics Using ODS, for more information. The survival plot is produced by default; other graphs are produced by using the PLOTS= option in the PROC LIFETEST statement. You can reference every graph produced through ODS Graphics with a name. The names of the graphs that PROC LIFETEST generates are listed in Table 49.5, along with the required keywords for the PLOTS= option.
ODS Graph Name 
Plot Description 
PLOTS=Option 

DensityPlot 
Estimated density for lifetable method 

FailurePlot 
Estimated failure function 

HazardPlot 
Estimated hazard function for lifetable method or smoothed hazard for productlimit method 

LogNegLogSurvivalPlot 
Log of negative log of the estimated survivor function 

NegLogSurvivalPlot 
Negative log of the estimated survivor function 

SurvivalPlot 
Estimated survivor function 

SurvivalPlot 
Estimated survivor function with number of subjects at risk 

SurvivalPlot 
Estimated survivor function with pointwise confidence limits 

SurvivalPlot 
Estimated survivor function with equalprecision band 

SurvivalPlot 
Estimated survivor function with HallWellner band 

SurvivalPlot 
Estimated survivor function with homogeneity test pvalue 
PROC LIFETEST passes a number of summary statistics as dynamic variables to the ODS Graphics for survival plots. Table 49.6 and Table 49.7 list these additional dynamic variables for the KaplanMeier curves and the lifetable curves, respectively. These dynamic variables are not declared in the templates for the survival curves, but you can declare them and use them to enhance the default plots. The names of the dynamic variables depend on the STRATA= suboption of the PLOTS=SURVIVAL option: STRATA=INDIVIDUAL produces a separate plot for each stratum, and STRATA=OVERALL produces one plot with overlaid curves.
STRATA= 
Dynamic 
Description 

OVERLAY 
StrVal 
Label for the th stratum 
NObs 
Number of observations in the th stratum 

NEvent 
Number of events in the th stratum 

Median 
Median survival time of the th stratum 

LowerMedian 
Lower median survival time of the th stratum 

UpperMedian 
Upper median survival time of the th stratum 

pctMedianConfid 
Percent confidence of the median intervals 

INDIVIDUAL 
NObs 
Number of observations 
NEvent 
Number of events 

Median 
Median survival time 

LowerMedian 
Lower median survival time 

UpperMedian 
Upper median survival time 

pctMedianConfid 
Percent confidence of the median interval 
STRATA= 
Dynamic 
Description 

OVERLAY 
StrVal 
Label for the th stratum 
NObs 
Number of observations in the th stratum 

NEvent 
Number of events in the th stratum 

INDIVIDUAL 
NObs 
Number of observations 
NEvent 
Number of events 
See the section The Graph Template Language and Example 21.5 in Chapter 21, Statistical Graphics Using ODS, for more information about dynamic variables and ODS Graphics.
Copyright © 2009 by SAS Institute Inc., Cary, NC, USA. All rights reserved.