[R] survival curve for only certain values of a factor

From: Chang Liu <changisme_at_hotmail.com>
Date: Wed, 12 Mar 2008 17:13:04 -0700


Using the built-in dataset aml as an example:  

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?  


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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