Mining Multiple-Level Association Rules Items often form hierarchies Flexible support settings Items at the lower level are expected to have lower support Exploration of shared multi-level mining(agrawal Srikant@VLB95, Han Fu@VLDB95) uniform support reduced support Level l Milk min sup =5% Level 1 Support=10%1 min sup=5% Level 2 Milk Skim milk Level2 min_sup=5% [support=6%1: [support=4%1 min sup =3% 77 Mining Multiple-Level Association Rules ◼ Items often form hierarchies ◼ Flexible support settings ◼ Items at the lower level are expected to have lower support ◼ Exploration of shared multi-level mining (Agrawal & Srikant@VLB’95, Han & Fu@VLDB’95) uniform support Milk [support = 10%] 2% Milk [support = 6%] Skim Milk [support = 4%] Level 1 min_sup = 5% Level 2 min_sup = 5% Level 1 min_sup = 5% Level 2 min_sup = 3% reduced support