Awesome! Thank you so much. I tried adding it to the LSMEANS statement (as below) but it would not run. Can you make any suggestions to this code? Thank you!!   proc mixed; class trt ID; model logng=trt; lsmeans trt/adjust=tukey plots=diffogram; run; ... View more

Thanks for the reply! Do you know how to write code in Mixed that tells SAS to do the Tukey groupings? In the code I provided, I get the Tukey-adjusted P-values but have to figure out the groupings (e.g., A, B, C;  LS-means with the same letter are not significantly different) on my own. It is not hard to do, but I want SAS do it for me! I know how to do it in GLM and GLIMMIX (the lines option) just not in Mixed (the lines option does not work). Thank you for your help!   ... View more