[R] Get significant codes from a model output fit with, GEE package

[david oseguera montiel]

Thank very much Dennis,
I much appreciate your time and help. The example was very clear.

Do you know if it is possible to get the variance do to the random 
effect or the correlation within random variable from the same 
reproducible example you post.

I used to be able to get it when using a lme4 with the VarCorr function 
but not in a model fit with GEE package.

Regards,
David