[R] How to access results of survival analysis

[Uwe Ligges]

Heinz Tuechler wrote:
> 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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No, the print methods do not return those values.
But you can copy code for calculation of the required values from those 
print methods into your own functions...

Uwe Ligges