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

From: Dieter Menne <dieter.menne_at_menne-biomed.de>
Date: Thu, 13 Mar 2008 07:20:44 +0000 (UTC)

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



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