Displaying 2 results from an estimated 2 matches for "survift".
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survfit
2011 Sep 05
1
SAS code in R
...s.
Can anyone help me to translate the SAS code above into R code so that I can check I am doing things correctly? I am using R version 2.9.2 on Windows XP Professional.
I think it would begin as follows:
library(cmprsk)
fit1 <- coxph(Surv(withtime,wcens)~ sex+treat,data=pudat2)
my.fit <- survift(fit1)
summary(my.fit)
Unfortunately, the estimates shown do not match those of SAS.
Additionally, can you use survfit with crr? If not, any suggestions as to how I may obtain the necessary estimates in a competing risks setting?
Thank you for any help you can give.
Laura
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2007 May 07
1
Predicted Cox survival curves - factor coding problems..
The combination of survfit, coxph, and factors is getting confused. It is
not smart enough to match a new data frame that contains a numeric for sitenew
to a fit that contained that variable as a factor. (Perhaps it should be smart
enough to at least die gracefully -- but it's not).
The simple solution is to not use factors.
site1 <- 1*(coxsnps$sitenew==1)
site2 <-