document: On detecting differences between groups Understanding the differences between contrasting groups is a fundamental task in data analysis . This realization has led to the development of a new special purpose data mining technique , contrast-set mining . We undertook a study with a retail collaborator to compare contrast-set mining with existing rule-discovery techniques . To our surprise we observed that straightforward application of an existing commercial rule-discovery system , Magnum Opus , could successfully perform the contrast-set-mining task . This led to the realization that contrast-set mining is a special case of the more general rule-discovery task . We present the results of our study together with a proof of this conclusion .
doc_bio_tags: O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O