[R] Entire Organization Switching from SAS to R - Any experience?

[dave fournier]

It is true that R does not offer support for custom likelihood functions
in nonlinear mixed models. However you can switch to R and use
AD Model Builder's random effects module http://admb-project.org
This is freely available software and it is more flexible than
proc nlmixed. I'm sure there are people involved in the project who
would be happy to help.

   Dave




>We use SAS and R here (a biostat department and consulting unit), in
>part because there are some things SAS does that R doesn't.  In
>particular, we use SAS proc nlmixed with custom likelihood functions.  >R
>has similar capability but does not allow custom likelihood; the >authors
>say adding it would be non-trivial.


-- 
David A. Fournier
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