https://communities.sas.com/t5/SAS-Procedures/PROC-GLM/m-p/33322#M8064 yes. That code looks reasonable. However, GLM uses "effect" coding and you are probably thinking of "reference" coding. Check out the documentation for a description of the two. <BR /> <BR /> The various test statistics are the same either way, but I find that it is messier to interpret the coefficients in effect coding. The only way to get reference cell coding is to manually enter the dummy variables as numeric (which makes it harder to get overall effects for classes with more than two levels). Fri, 11 Jun 2010 16:09:12 GMT Doc_Duke 2010-06-11T16:09:12Z https://communities.sas.com/t5/SAS-Procedures/PROC-GLM/m-p/33321#M8063 Can I include dummy variables in proc glm?<BR /> <BR /> I use the following but am not sure if the results should look the way they do.<BR /> <BR /> proc glm data=final;<BR /> class income_bracket kiddummy year;<BR /> model units= units_cat kiddummy |year;<BR /> lsmeans kiddummy year /adjust = tukey;<BR /> run; Wed, 09 Jun 2010 19:34:41 GMT https://communities.sas.com/t5/SAS-Procedures/PROC-GLM/m-p/33321#M8063 spg 2010-06-09T19:34:41Z https://communities.sas.com/t5/SAS-Procedures/PROC-GLM/m-p/33322#M8064 yes. That code looks reasonable. However, GLM uses "effect" coding and you are probably thinking of "reference" coding. Check out the documentation for a description of the two. <BR /> <BR /> The various test statistics are the same either way, but I find that it is messier to interpret the coefficients in effect coding. The only way to get reference cell coding is to manually enter the dummy variables as numeric (which makes it harder to get overall effects for classes with more than two levels). Fri, 11 Jun 2010 16:09:12 GMT https://communities.sas.com/t5/SAS-Procedures/PROC-GLM/m-p/33322#M8064 Doc_Duke 2010-06-11T16:09:12Z