Dummy coding

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Dummy coding

Hi,

I am trying to get SAS to print out its dummy coding structure using proc glm, because I am assuming it's using the last categorical variable as the reference variable with 0 0 0 (I have 3 treatment groups) and additionally, how would I change it so instead of 0s for the reference variable I have -1s?

Thanks!!

Sabina

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Posts: 1,600

Re: Dummy coding

You can obtain the dummy variable coding from PROC GLMMOD.

You can't change the dummy variable coding used by PROC GLM, however if you want a level to be -1 and another level to be +1, you can achieve this via the CONTRAST statement of PROC GLM.

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