[R] Plotting K-M Curve when have several strata
David Barron
david.barron at jesus.ox.ac.uk
Wed Mar 26 13:25:30 CET 2003
You could try something like:
plot(foo[1],conf.int=TRUE)
par(new=TRUE)
plot(foo[2],conf.int=TRUE,col=2)
Seems to work!
David
----- Original Message -----
From: "Ko-Kang Kevin Wang" <kwan022 at stat.auckland.ac.nz>
To: "R Help" <r-help at stat.math.ethz.ch>
Sent: Wednesday, March 26, 2003 12:13 PM
Subject: [R] Plotting K-M Curve when have several strata
> Hi,
>
> If I have:
> foo <- survfit(y ~ x)
> where y is a survival object and x is a n-level factor. The documentation
> says when I plot(foo), the confidence intervals will not be plotted (which
> I guess is understandable as otherwise the plot will get really messy).
>
> I tried to plot with confidence intervals by using:
> plot(foo, conf.int = TRUE)
> and indeed the resulting plot is messy. However I'm just wondering if I
> can (suppose x is a 2-level factor) use different colours and line types
> for the confidence lines? If I do:
> plot(foo, conf.int = TRUE, col = 1:2)
> then I'll get two different colours. What I would like is to then plot
> the confidence lines using lty = 2 (while keeping the colour).
>
> Can I do this?
>
> --
> Cheers,
>
> Kevin
>
> --------------------------------------------------------------------------
----
> /* Time is the greatest teacher, unfortunately it kills its students */
>
> --
> Ko-Kang Kevin Wang
> Master of Science (MSc) Student
> SLC Tutor and Lab Demonstrator
> Department of Statistics
> University of Auckland
> New Zealand
> Homepage: http://www.stat.auckland.ac.nz/~kwan022
> Ph: 373-7599
> x88475 (City)
> x88480 (Tamaki)
>
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