[R] Survival statistics--displaying multiple plots

Robert A LaBudde ral at lcfltd.com
Thu May 3 05:48:43 CEST 2007

? layout()
? par()


layout(matrix(c(1,2,3),1,3,byrow=TRUE) #3 plots side-by-side

Then use plot() three times to generate each of your graphs.

At 11:14 PM 5/2/2007, Greg wrote:
>I should clarify. I can generate plots for each category individually but
>not for all three on the same chart.
>-----Original Message-----
>From: Gregory Pierce [mailto:pierce.gregory at gmail.com]
>Sent: Wednesday, May 02, 2007 10:21 PM
>To: 'r-help at stat.math.ethz.ch'
>Subject: Survival statistics--displaying multiple plots
>Hello all!
>I am once again analyzing patient survival data with chronic liver disease.
>The severity of the liver disease is given by a number which is continuously
>variable. I have referred to this number as "meld"--model for end stage
>liver disease--which is the result of a mathematical calculation on
>underlying laboratory values. So, for example, I can generate a Kaplan-Meier
>plot of patients undergoing a TIPS procedure with the following:
> >plot(survfit(Surv(days,status==1),subset(tips,meld<10))
>where "tips" is my data set, "days" is the number of days alive, and meld is
>the meld score.
>What I would like to do is display the survival graphs of patients with
>meld<10, 10<meld<20, and meld>20. I am unsure about how to go about this.
>Any suggestions would be appreciated.

Robert A. LaBudde, PhD, PAS, Dpl. ACAFS  e-mail: ral at lcfltd.com
Least Cost Formulations, Ltd.            URL: http://lcfltd.com/
824 Timberlake Drive                     Tel: 757-467-0954
Virginia Beach, VA 23464-3239            Fax: 757-467-2947

"Vere scire est per causas scire"

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