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 P.O. Box 2040, Sidney, B.C. V8l 3S3 Canada Phone/FAX 250-655-3364 http://otter-rsch.com ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
