[R] help--Cox ph model
Song, Guangchun
Guangchun.Song at stjude.org
Mon Mar 10 17:43:18 CET 2003
Dear r-users,
I want to use the Cox's ph model to analyze survival data set. How can I
extract the model coefs. and Wald test p-value or Score?
For example: I use the data set melanom in iSwR package.
> library(survival)
> data(melanom)
> attach(melanom)
> cox.model <- coxph(Surv(days,status==1)~sex)
> summary(cox.model)
Call:
coxph(formula = Surv(days, status == 1) ~ sex)
n= 205
coef exp(coef) se(coef) z p
sex 0.662 1.94 0.265 2.50 0.013
exp(coef) exp(-coef) lower .95 upper .95
sex 1.94 0.516 1.15 3.26
Rsquare= 0.03 (max possible= 0.937 )
Likelihood ratio test= 6.15 on 1 df, p=0.0131
Wald test = 6.24 on 1 df, p=0.0125
Score (logrank) test = 6.47 on 1 df, p=0.0110
Thanks.
Guangchun
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