Dear SAS Community   I am trying to run PROC GLM with hovtest and Tukey on SAS studio. Actually the script works perfectly outside SAS studio environment but not within it. I try to compare Brain volume (BPF) within groups (groupe 2 containing 3 groups HC, MS1 and MS2)   The script:  /*Brain volume : HC vs MS1 vs MS2 */ PROC GLM DATA=trav ; CLASS Groupe2 ; MODEL BPF = Groupe2 ; MEANS Groupe2 / HOVTEST WELCH TUKEY ; RUN ;   The information from journal:   1 OPTIONS NONOTES NOSTIMER NOSOURCE NOSYNTAXCHECK; 72 73 PROC GLM DATA=trav ; 74 CLASS Groupe2 ; 75 MODEL BPF = Groupe2 ; 76 MEANS Groupe2 / HOVTEST WELCH TUKEY ; 77 RUN ;   ERROR: Invalid characters were present in the data. ERROR: Une erreur s'est produite lors du traitement des données texte. ERROR: Invalid characters were present in the data. NOTE: The SAS System stopped processing this step because of errors. NOTE: PROCEDURE GLM used (Total process time): real time 0.07 seconds cpu time 0.07 seconds   78 79 OPTIONS NONOTES NOSTIMER NOSOURCE NOSYNTAXCHECK; 92     Could you help me with this? Is this only a problem of language or syntax?    Than you   ... View more