topic Re: Categorical Variables Using Proc GLM in Statistical Procedures

Categorical Variables Using Proc GLM

kbry1180 — Sun, 06 May 2018 01:04:49 GMT

I am running OLS regressions with many categorical variables as independent variables. I read other posts saying that using Proc GLM can make this process easier especially when there are many categorical variables within a category. I am seeing if there is a way to manually choose which categorical variable I want to omit, i.e. choose as the reference variable.

Re: Categorical Variables Using Proc GLM

PGStats — Sun, 06 May 2018 03:11:11 GMT

If proc glm, you can specify which level of a class variable is the reference with option REF=

class sex(ref='M');

Re: Categorical Variables Using Proc GLM

Rick_SAS — Sun, 06 May 2018 20:34:23 GMT

And for procedures that do not support the REF= option, see this Usage Note about how to set the reference level.