10-28-2016 10:42 AM
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.
11-02-2016 11:53 AM
There are multiple ways to paramaterize class variables. You can change the paramaterization in the CLASS statement with the PARAM option.
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:
You can also use the REF option to specify the reference level.
PROC GENMOD data=data; class treatment(ref='Control'); model outcome = treatment; run;