proc univariate data=existing; var a b c; output out=existing sum=Asum Bsum Csum N=Act Bct Cct; run; I already have an existing dataset with 10 variables. I want to add the additional 6 variables from the proc univariate procedure but when I use the output statement, it overwrites all the existing variables instead of adding additional columns. How can I make so it so that the outputs I want (sum and N) are added to an existing dataset? Thank you very much. ... View more

proc freq data=x nlevels; table patient_id; run; I am trying to count the # of unique patients in this data. Does the resulting output show the number of unique patient ids? or just the total amount of observations with non-missing ids. Thank you, I appreciate the help. ... View more