A version of this got it to work for me. All I had to do was: PROC GLM DATA = QUESTION5; CLASS COLOR; MODEL WEIGHT = COLOR; MEANS COLOR /TUKEY LINES; RUN; When the cell sizes are unequal, which in my data set they are, SAS defaults to the CLDIFF option of the MEANS statement, unless you explicitly tell it to express significant mean differences with the LINES statement. Thank you for the help.
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