Frequent Itemsets and Association rules Association Rules AssociatⅰonRu|es If-then rules about the contents of baskets 1,2…,}→ means:" if a basket contains all of 1., iK then it is likely to contain j Confidence of this association rule is the probability of j given i1灬…ikFrequent Itemsets and Association Rules 12 Association Rules ▪ If-then rules about the contents of baskets. ▪ {i1 , i2 ,…,ik } → j means: “if a basket contains all of i1 ,…,ik then it is likely to contain j.” ▪ Confidence of this association rule is the probability of j given i1 ,…,ik . Association Rules