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survival curve for only certain values of a factor
2 messages · Chang Liu, Dieter Menne
Chang Liu <changisme <at> hotmail.com> writes:
data(aml) If I use instead dummy variables: aml$x1 = (aml$x=="maintained")aml$x2 = (aml$x=="unmaintained") and I want to plot the survival curve using x1, x2, and I just want the 2
levels, rather than 4 curves from: I don's understand what you want, but the first step is definitively incorrect apart from the missint line break. The levels of aml are "Maintained","Nonmaintained" so both your "==" lead to all-false levels. Dieter