Nothing
Three choices are possible:
None: Plot is performed for the entire data set with no groups.
Group: A variable must be selected. By default, only factors variables with five or less categories can be selected.
If the plotted variable is of survival class Kaplan-Meier curves are displayed.
Survival: Select time to event variable, censoring variable and event categories.
Note: the "survival" button option is only possible if the plotted variable is not of class survival.
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