Implementing skew-normal model in PROC NLMIXED?

quentinread — Tue, 02 Dec 2025 19:31:02 GMT

I am interested in implementing a skew-normal mixed model in PROC NLMIXED. So far, I have been using Stan, via the R package brms, to fit this type of model in a Bayesian framework. But I am curious whether it is possible to do so in PROC NLMIXED as I have clients who are more comfortable with SAS and with Frequentist inference. If anyone is aware of existing SAS code that does this, I would be very interested. Or, if someone could point me to general guidelines or a template that would help me incorporate a distribution of my choosing into PROC NLMIXED, that would be extremely helpful.

For reference here is a very old thread where someone has posted code that generates the PDF for a skew-normal distribution in a DATA step.

Thanks very much for your help!

Re: Implementing skew-normal model in PROC NLMIXED?

Ksharp — Wed, 03 Dec 2025 07:36:39 GMT

PROC NLMIXED is for non-linear mixed model. If you need to perform Bayes Analysis, PROC MCMC is the best tool ,pardon me my limited stat knowledge and can not give you the answer.
Maybe @Rick_SAS @StatDave could.

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Implementing skew-normal model in PROC NLMIXED?

Re: Implementing skew-normal model in PROC NLMIXED?