Dear all,

I am doing

library(survival)
fit   <- coxph(Surv(futime,fustat) ~ rx, ovarian)

plot(survfit(fit,newdata=ovarian),col=c(1,2))
legend("bottomleft", legend=c("rx = 0", "rx = 1"),
       lty=c(1,2),col=c(1,2))
Is this correct to compare these two groups? Is the 0.31 the p-value that
the median f two groups are equal
Why lty does not work here?

Many thanks in advance.
Cheba

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