Hello:
Using the built-in dataset aml as an example:
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:
fit <- survfit(Surv(time, status) ~ x1+x2, data=aml)
plot(fit)
I guess because there are 2 levels for each variable?
Thanks!
p.s. I need to do this more because my dummies are not good to combine and I
want to be able to work with them separately also, not becuase I'm crazy!
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