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 ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
