I am using PROC MIXED to examine differeces across 5 different treatments. I would like to know how to enable my 'LSMEANS variable = treatment / ADJUST=TUKEY;' statement to display differences using letters in the output. Any advice is appreciated.   I am using the following code: %MACRO MIXED1 (DATASET, DEPVAR, ID); PROC MIXED DATA = &DATASET; CLASS TRT BLOCK PEN SEX; MODEL &DEPVAR = TRT/RESIDUAL OUTP=STUDENTRESIDUAL; RANDOM BLOCK; LSMEANS TRT/PDIFF=all; STORE STOREDATA; RUN;   PROC PLM RESTORE=STOREDATA; LSMEANS TRT/PDIFF=ALL PLOT=MEANPLOT CL LINES; RUN;   PROC PRINT DATA = STUDENTRESIDUAL; WHERE ABS(STUDENTRESID) GT 3.5; RUN;   PROC UNIVARIATE DATA=STUDENTRESIDUAL NORMAL PLOT; VAR STUDENTRESID; RUN;   PROC KDE DATA=STUDENTRESIDUAL; UNIVAR STUDENTRESID; RUN;   QUIT; %MEND; %MIXED1 (MasterFile, pigWt1, 1);   ... View more