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. -- View this message in context: http://r.789695.n4.nabble.com/Cox-model-random-effect-on-a-variable-with-3-levels-tp4665815.html Sent from the R help mailing list archive at Nabble.com. [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.