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Normal residual in GLIMMIX?
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Bijay Tamang  
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 More options Nov 11, 6:02 pm
Newsgroups: comp.soft-sys.sas
From: tamangbi...@GMAIL.COM (Bijay Tamang)
Date: Wed, 11 Nov 2009 18:02:40 -0500
Local: Wed, Nov 11 2009 6:02 pm
Subject: Normal residual in GLIMMIX?
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I am using the following code to analyze my count data. "Nxtot" is the
number of roots. When I use the following code, some of the variables and
their interactions are significant but residuals are not normal. If I use
"Dist=lognormal link=identity" in the following code, none of the variables
and their interactions are significant but the residuals are normal. AIC
values are below 300 when dist=lognormal is used but above 1000 when
dist=poisson is used.

Do residuals need to be normal in GLIMMIX?

PROC GLIMMIX data=nx4 method=quad plots=all;
    class wba location;
    MODEL nxtot = wba depth1 bd/DIST=poisson LINK=log SOLUTION ddfm=bw;
    random _residual_;
RUN;

Thanks


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