On Oct 30, 2010, at 4:36 PM, cheba meier wrote:
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 this a trick question?
Is the 0.31 the p-value that
the median f two groups are equal
That seems unlikely because one of the curves has not even reached the
median. You might want to look at
?anova.coxph
Why lty does not work here?
Perhaps you should define "not work". It seems to create a solid and
dashed line in the legend when I use it.
?par # .... 1=solid (default), 2=dashed,....
Many thanks in advance.
Cheba
David Winsemius, MD
West Hartford, CT
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