Thanks, Steve But I'm still worried. In the SAS documentation it says that: 'R-side effects in the RANDOM statement do not generate model matrices; they serve only to index observations within subjects" The problem is my data. I'm using more that one observation per individual, therefore I'm using GLIMMIX to consider each individual as a "cluster" item. I'm studing dogs within a comunity, and each person has one or more dogs, therefore I'm using the "owner" as an item that should be considered by the procedure. If I understood correctly what SAS said, I would need R-side effects, because they would be serving me to index observations within subjects. Am I understanding it correctly? What do you think? Could I still use laplace for my data?
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