https://communities.sas.com/t5/SAS-Procedures/PROC-GLM-and-parameter-constraints/m-p/75995#M22059 Nevermind -- I see that PROC GENMOD allows me to specify how effects are parameterized. Mon, 02 Mar 2009 16:48:08 GMT deleted_user 2009-03-02T16:48:08Z https://communities.sas.com/t5/SAS-Procedures/PROC-GLM-and-parameter-constraints/m-p/75994#M22058 PROC GLM constrains categorical data parameterization such that the coefficient for the last level is automatically zeroed, which can often be handy. But I'm trying to create estimates constrained such that the sum of all the level coefficients is zero, like that produced in PROC CATMOD. Any ideas? I'd use PROC CATMOD instead, but I don't have any fancy response function in mind, just a straightforward least squares regression.<BR /> <BR /> Many thanks, - Jonathan Mon, 02 Mar 2009 15:33:23 GMT https://communities.sas.com/t5/SAS-Procedures/PROC-GLM-and-parameter-constraints/m-p/75994#M22058 deleted_user 2009-03-02T15:33:23Z https://communities.sas.com/t5/SAS-Procedures/PROC-GLM-and-parameter-constraints/m-p/75995#M22059 Nevermind -- I see that PROC GENMOD allows me to specify how effects are parameterized. Mon, 02 Mar 2009 16:48:08 GMT https://communities.sas.com/t5/SAS-Procedures/PROC-GLM-and-parameter-constraints/m-p/75995#M22059 deleted_user 2009-03-02T16:48:08Z