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
A B C
0.24093054 -0.08332041 -0.15761013
I want to compare treatment B /treatment A and Treatment C /treatment A.
Is it possible to consider random effect for this variable "treatment" with 3 levels?
what is the interpretation of the 3 coefficients?
Thank you.
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