Date: Mon, 11 Apr 2011 11:08:11 -0400
Sender: "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From: SUBSCRIBE SAS-L Ameribrit <FRP3@PITT.EDU>
Subject: NLMIXED Versus Proc Mixed
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I am running a bivariate model in SAS using proc mixed and it runs great
and in a couple of seconds. What I would like to do is to reproduce these
same results in NLMIXED.
What I am finding is that it runs forever even with a single quadrature
point. I have tried taking the values I get from Proc mixed with ML option
and using these as starting values in NLMIXED but I get 'NO VALID
PARAMETER POINTS FOUND:.
Why does Proc Mixed give instant results yet NLMIXED takes exponentially
longer or does not run at all on the same dataset.