Hi all,

I've trying to use R to fit some longitudinal models, mostly via lme and
nlme packages. However, it seems that many standard models are lacking,
such as antedependence models or factor analytic models for covariance
matrices. These models are readily available in SAS. Does an recommend
other packages for the job in R? I don't really care if I am in frequentist
or bayesian world as long as I have more modeling flexibility. I would also
be interested in doing that in WINBUGS/JAGS.

All the best,

Antonio.

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