--- begin included message --- ... I am trying to perform survival analysis but continually get errors when extracting from this data.frame:
attempt 1: > X <- Surv(B27.vec$AgeOn,B27.vec$UV) > survdiff(X,rho=0,data=uvf) Error in x$terms : $ operator is invalid for atomic vectors ... --------- end inclusion ---- As should be apparent from Gerrit Eichner's response, your problem is that survdiff expects a formula as the first argument and you gave it a survival object instead. However, the error message you got is really not helpful. I've now added a check to survreg that will result in a more apropos response from the routine. Terry Therneau ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
