PROC LIFETEST: ODS Graphics :: SAS/STAT(R) 9.22 User's Guide

The LIFETEST Procedure

ODS Graphics

This section describes the use of ODS for creating statistical graphs with the LIFETEST procedure. To request these graphs you must specify 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.

Table 49.5 ODS Graphics Produced by PROC LIFETEST
ODS Graph Name	Plot Description	PLOTS=Option
DensityPlot	Estimated density for life-table method	PDF
FailurePlot	Estimated failure function	SURVIVAL(FAILURE)
HazardPlot	Estimated hazard function for life-table method or smoothed hazard for product-limit, Breslow, or Fleming-Harrington method	HAZARD
LogNegLogSurvivalPlot	Log of negative log of the estimated survivor function	LOGLOGS
NegLogSurvivalPlot	Negative log of the estimated survivor function	LOGSURV
SurvivalPlot	Estimated survivor function	SURVIVAL
SurvivalPlot	Estimated survivor function with number of subjects at risk	SURVIVAL(ATRISK=)
SurvivalPlot	Estimated survivor function with pointwise confidence limits	SURVIVAL(CL)
SurvivalPlot	Estimated survivor function with equal-precision band	SURVIVAL(CB=EP)
SurvivalPlot	Estimated survivor function with Hall-Wellner band	SURVIVAL(CB=HW)
SurvivalPlot	Estimated survivor function with homogeneity test p-value	SURVIVAL(TEST)

Additional Dynamic Variables for Survival Plots Using ODS Graphics

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 Kaplan-Meier curves and the life-table 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.

Table 49.6 Additional Dynamic Variables for **`Stat.Graphics.ProductLimitSurvival`**
STRATA=	Dynamic	Description
OVERLAY	StrVal $\text{[math]}$	Label for the $\text{[math]}$ th stratum
	NObs $\text{[math]}$	Number of observations in the $\text{[math]}$ th stratum
	NEvent $\text{[math]}$	Number of events in the $\text{[math]}$ th stratum
	Median $\text{[math]}$	Median survival time of the $\text{[math]}$ th stratum
	LowerMedian $\text{[math]}$	Lower median survival time of the $\text{[math]}$ th stratum
	UpperMedian $\text{[math]}$	Upper median survival time of the $\text{[math]}$ 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

Table 49.7 Additional Dynamic Variables for **`Stat.Graphics.LifetableSurvival`**
STRATA=	Dynamic	Description
OVERLAY	StrVal $\text{[math]}$	Label for the $\text{[math]}$ th stratum
	NObs $\text{[math]}$	Number of observations in the $\text{[math]}$ th stratum
	NEvent $\text{[math]}$	Number of events in the $\text{[math]}$ 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.

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