Hi!   Given a dataset sorted by PID (ID of each participant, N=77) with several continuous variables.    I want to obtain which are the observations (PID) with values > 2 SD from the mean.   I am working with data in a temporary dataset called -- cortical_stroke_complete2   The variable of interest is : PCh_CONTRA_entorhinal_tck   This is the code that I have been trying without success, I tried different variables and always obtained the same PID.   proc sql noprint;   select mean(PCh_CONTRA_entorhinal_tck) into : mean from cortical_stroke_complete2;   select std(PCh_CONTRA_entorhinal_tck) into :std from cortical_stroke_complete2; quit; data cortical_stroke_complete2;   set cortical_stroke_complete2;    where PCh_CONTRA_entorhinal_tck >&mean+2*&std ; proc print;run;     Basic SAS programmer.   Thank you so much! ... View more