Does anyone know how to extract the value stored in "exp(-coef)" (negative!) in the summary of a coxph model? My model is fitted like this:
mycoxfit <- coxph(Surv(time, status) ~ therapy, data = mydata)
I can extract the exp(coef) by
coef(mycoxfit)
or
summary(mycoxfit)$coefficients[, 1]
But I am not able to read the values from the column "exp(-coef)" (the exp from the negative coef).
The reason why I need this is: If I want to get the HR for therapy = 1, this is just the exp(coef). But I also want the HR for therapy = 0 - this should be the "exp(-coef"), correct? Or is it the inverse of exp(coef), i.e. "1 - exp(coef)"?
Thank you!
