SAS – Custom Statistics from Merge Operations

The code below shows how to get custom statistics from merge operations above and beyond what the standard DATA step output provides.

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    Developed by Mario Segal

data c;
merge a (in=left) b (in=right) end=eof;
retain missleft missright;
by merge_key;
if left then output; *We want all records of left, modify as needed;
*collect the desired statistics;
if left and not right then missright+1;
if right and not left then missleft+1;
if eof then do; *output the statistics;
put ‘There were ‘ missleft ‘Record on left dataset not found on the right dataset’;
put ‘WARNING: There were ‘ missright ‘ Records on right dataset not found on the left dataset’;
end;
drop miss: ; *don’t forget to drop the statistci variables or they will be part of the output dataset;
run;