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: 2,996

Re: Dummy coding

Posted in reply to libragirl9

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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Paige Miller
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