I answer my own question.
I was disturbed by the syntax of the SAS code for "proc mixed", which uses
the same procedure for mixed or non mixed effect model. Moreover, the type
of variance-covariance structure is indicate by one parameter.
R is more intuitive and supple : there is two different fu
I would like to make clear that the SAS "unstructured" correlation matrix in
the second model was :
Estimated R Correlation Matrix for id 1
1 1. 0.8575 0.6984 0.4657 0.3165
2 0.8575 1. 0.8557 0.5670 0.4039
3 0.6984 0.8557 1.0
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