The time-transform (tt() arguments) feature is the most recent addition
to coxph. Most of the follow-up functions, in particular survfit(fit)
have not yet been updated to deal with such models. Your message points
out that I need to at least update them to add a "not yet available"
error message
Dear all,
Let's assume I have a clinical trial with two treatments and a time to
event outcome. I am trying to fit a Cox model with a time dependent
treatment effect and then plot the predicted survival curve for one
treatment (or both).
library(survival)
test <-
list(time=runif(100,0,10),e
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