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Random effects distribution in proc glimmix

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New Contributor Oms
New Contributor
Posts: 2

Random effects distribution in proc glimmix

Hi SAS Community,

I have a quick question about proc glimmix. When using proc nlmixed, the analyst specifies the distribution of the random effects. Is there any such option with proc glimmix? I could not see. If there is no such option in proc glimmix, can anyone please suggest a way to specify a random effects distribution different from the normal distribution? Thanks.

Valued Guide
Valued Guide
Posts: 684

Re: Random effects distribution in proc glimmix

The random effects can only have a normal distribution in glimmix (of course, the response variable can have any of the conditional distributions in the exponential family). Random effects must also be normal in nlmixed (no other ones allowed).  With nlmixed, there are some tricks to get other random-effect distributions (I have tried some), but these are very tricky to use, and often do not converge. Fortunately, most model fitting results are not too dependent on the normal assumption for the random effects.

New Contributor Oms
New Contributor
Posts: 2

Re: Random effects distribution in proc glimmix

Thanks, Ivm.

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