[R] help drawing kaplan-meier plot starting from 0
rggefrm at ucl.ac.uk
Thu Jan 16 17:00:05 CET 2003
Dear help news reader,
I'm trying to draw a Kaplan-Meier curve and would like to ask the news
group for some help
Supposing I have study comapring two drugs, "A", and "B" and I recorde the
time to get to the clinical endpoint (Time), in my case becommming virus free.
I have setup the following frame:
Time c Drug
1 5 1 A
2 7 1 B
3 2 1 A
4 10 1 B
5 6 1 A
6 8 1 B
"c" contains the coding if sucessful or not, but I think at the moment that
is not important.
fitstudy <- survfit(Surv(Time) ~ Drug, data=study) or
fitstudy <- fitstudy <- survfit(Surv(Time, c) ~ Drug, data=study)
which gives me a Kaplan-Meier Curve, starting with 1. However I would like
to the a plot
starting with "0" and than showing the increasing numbers of patients
becomming "virus negative".
It would be great, if someone could point me in the right direction where I
can find the answer.
Many thanks in advance
Frank Mattes, MD
Department of Virology
Royal Free and University Medical School
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