Multi-level Association: Flexible Support and Redundancy filtering Flexible min-support thresholds: Some items are more valuable but less frequent Use non-uniform, group-based min-support E.g. diamond watch, camera]: 0. 05% bread milk 5%/ Redundancy filtering Some rules may be redundant due to ancestor"relationships between items milk= wheat bread [support=8%, confidence= 70%] 2 milk wheat bread [support= 2%, confidence = 72%] The first rule is an ancestor of the second rule a rule is redundant if its support is close to the expected"value based on the rule's ancestor8 Multi-level Association: Flexible Support and Redundancy filtering ◼ Flexible min-support thresholds: Some items are more valuable but less frequent ◼ Use non-uniform, group-based min-support ◼ E.g., {diamond, watch, camera}: 0.05%; {bread, milk}: 5%; … ◼ Redundancy Filtering: Some rules may be redundant due to “ancestor” relationships between items ◼ milk  wheat bread [support = 8%, confidence = 70%] ◼ 2% milk  wheat bread [support = 2%, confidence = 72%] The first rule is an ancestor of the second rule ◼ A rule is redundant if its support is close to the “expected” value, based on the rule’s ancestor