Hi R users! I am trying to calculate the variance of the parameter under the null (Ho) using the "prop.odds" function in the timereg package. I know var.gamma will give the variance of the parameter, but how do I find this under Ho? For the Cox PH model, I used iter = 0 and the "vcov" function: cox <- coxph(Surv(time, censor) ~ x, iter = 0, init = 0, data = dat) sig2 <- vcov(cox) Is there something similar to use for a prop.odds model? Thanks for the help! -- View this message in context: http://r.789695.n4.nabble.com/var-gamma-in-the-prop-odds-funtion-timereg-package-tp4713532.html Sent from the R help mailing list archive at Nabble.com.