You can add a horizontal reference line to the survival plot by adding the following statement to the template:
referenceline y=0.5;
You can do this by using the %StmtsTop macro. By default, this macro is empty. You can use the %StmtsTop macro to add new statements to the beginning of the block of statements that define the appearance of the graph. In contrast, you can use the %StmtsBottom macro to provide statements at the end of the statement block. ODS Graphics draws statements in the order in which they appear; therefore, reference lines should be drawn first so they do not obscure other parts of the graph.
The following step creates the plot in FigureĀ 23.26:
%ProvideSurvivalMacros %macro StmtsTop; referenceline y=0.5; %mend; %CompileSurvivalTemplates proc lifetest data=sashelp.BMT plots=survival(cb=hw test); time T * Status(0); strata Group; run;