Frequent Itemsets and Association rules Association Rules Support Simplest question: find sets of items that appear frequently in the baskets Support for itemset / the number of baskets containing all items in Sometimes given as a percentage Given a support threshold s, sets of items that appear in at least s baskets are called frequent ItemsetsFrequent Itemsets and Association Rules 6 Support ▪ Simplest question: find sets of items that appear “frequently” in the baskets. ▪ Support for itemset I = the number of baskets containing all items in I. ▪ Sometimes given as a percentage. ▪ Given a support threshold s, sets of items that appear in at least s baskets are called frequent itemsets. Association Rules