Displaying 1 result from an estimated 1 matches for "model_alea_int".
2013 Apr 30
0
Cox model: random effect on a variable with 3 levels
Question about package Coxme:
I develop a cox model that includes a variable "treatment" with 3 levels (A, B, C):
> model_alea_int <- coxme(Surv(delai, status) ~ (1|trt)+ strata(center) , data)
I am surprised that the output given in R is 3 coefficients for random effects whereas only 2 dummy variables are created:
> contrasts(data$trt)
B C
A 0 0
B 1 0
C 0 1
> ranef(model_alea_int)
$trt...