Note- one application of this code would be to check a group of duplicate rows to see if they have unequal values (you'd have to assign each one a unique id first, then subset the data for that group); if they do, then the "CompareDifferences" ODS output could be used to identify where the differences are. We had a question not too long ago about comparing multiple rows with the same patient-visit to see if they are the same; this application would be appropriate for that (and I've got my own data like that, too, which are multiple lab tests on the same blood sample repeated at different times).

It could also be used for inter-rater reliability.

-Mary