Programming the statistical procedures from SAS

Multinomial response variable and random factors in GLIMMIX procedure

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Multinomial response variable and random factors in GLIMMIX procedure

Hello,

I have a multinomial ordered response variable (0, 1 and 2) corresponding to population trends (negative, no trend, increasing); 2 continuous independient variables (use and distance) and I am controlling by taxonomy, so I have as random variables family adn genera nested into family. My final model code is:

proc glimmix data=sasuser.Indices_octene ;
class trend family genera;
model trend = use distance distance*distance / dist=multinomial solution;
random family genera(family);
run;

I would like to know:
- Is this a logistic regression with random factors?
- Why can't I get the AIC of the model? (I get it if I delete random factors for the model)
- How could I know if my model is correct? do I have to look at the residuals, and how could I do it?
- Should I wonder about overdispersion? how could I get a measure of that?

Maybe too many questions. Thank you very much.

Grego.
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Re: Multinomial response variable and random factors in GLIMMIX procedure

I also found that if I use a normal error distribution, the estimates are almost the same when using multinomial distribution, but with the oposite sign. How should I interpret the sign of the estimates in the model with multinomial error distribution?

Thanks.
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