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Proc GENMOD Class question

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New Contributor
Posts: 2

Proc GENMOD Class question

Hello, 

 

I want to know if there is a way that I can elimnate refrence option in class statement using genmod procedure?

Because when I run my model, it gives me the last category of each variable in the class as a reference to that variable.

Frequent Contributor
Posts: 98

Re: Proc GENMOD Class question

There are multiple ways to paramaterize class variables. You can change the paramaterization in the CLASS statement with the PARAM option. 

 

e.g.:

PROC GENMOD data=data;
     class treatment / param=X;
     model outcome = treatment;
run;

 where X is any of the options detailed here (e.g. ref, effect, glm, etc.). The default is the glm parameterization:

 

PROC GENMOD: CLASS Variable Parameterization

 

 

You can also use the REF option to specify the reference level.

 

e.g.: 

PROC GENMOD data=data;
     class treatment(ref='Control');
     model outcome = treatment;
run;
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