[R] How to access results of survival analysis

Heinz Tuechler tuechler at gmx.at
Fri Feb 4 23:17:53 CET 2005


Hello,

it seems that the main results of survival analysis with package survival
are shown only as side effects of the print method.

If I compute e.g. a Kaplan-Meier estimate by 
> km.survdur<-survfit(s.survdur) 
then I can simply print the results by 
> km.survdur
Call: survfit(formula = s.survdur)

      n  events  median 0.95LCL 0.95UCL 
  100.0    58.0    46.8    41.0    79.3 

Is there a simple method to access these results, e.g. if I want to print
only the median with the confidence limits?
Regarding the results of a Cox-PH-model I face the same situation. The
printed results are:
> cx.survdur.ipss_mds.sex
Call:
coxph(formula = s.survdur ~ x1 + x2, method = "efron")

       coef exp(coef) se(coef)     z      p
x1   0.6424      1.90    0.206 3.123 0.0018
x2.L 0.0616      1.06    0.263 0.234 0.8100

Likelihood ratio test=9.56  on 2 df, p=0.0084  n=58 (42 observations
deleted due to missing)

Is there a simple method to copy e.g. the coefficients and p-values in a
new object?

I am working with:
R : Copyright 2004, The R Foundation for Statistical Computing
Version 2.0.1  (2004-11-15), ISBN 3-900051-07-0
Survival package version: survival_2.16
Operating System: Windows 98SE

Thanks,
Heinz Tüchler




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