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fitm
2007 Sep 12
1
enquiry
...stimate a Cox model with nested effects basing on the
minimization of the overall AIC; I have two frailties terms, both gamma
distributed. There is a error message (theta2 argument misses) and I
don?t understand why. I would like to know what I have wrong. Thank you
very much for your time.
fitM7 <- coxph(Surv(lifespan,censured) ~ south + frailty(id,
dist='gamma')+ frailty(mob, dist='gamma'), data= usa)
tempfun <- function(theta1, theta2) {
fit <- coxph(Surv(lifespan,censured) ~ south + frailty(id,
dist='gamma', sparse= TRUE, theta=theta1)+ frailty(mob,...