Hi there, I am an M.Sc student with a question about coding for proc univariate.  I am wondering when it is appropriate to use a by statement when writing the code for Proc Univariate?  Here are my codes, and I am wondering which is the correct one   proc sort data=____; by trt dur; proc univariate data=____ normal plot; var ____; by trt dur; run;   OR would this be the right code   proc univariate data=____ normal plot; var ____ run;    trt=treatment  dur= duration    I have 5 treatments, with 2 time durations per treatment    ... View more