Frequent Itemsets and Association rules Association Rules Example: Confidence +B1={m,cb} B,=m, p, jl B3=m, by B4=c, jl B5={m,p,b} +b6=m, c,b, j] B,=ic, b,jl B8=ib, cN An association rule: m, b-c Confidence =2/4=50%Frequent Itemsets and Association Rules 13 Example: Confidence B1 = {m, c, b} B2 = {m, p, j} B3 = {m, b} B4 = {c, j} B5 = {m, p, b} B6 = {m, c, b, j} B7 = {c, b, j} B8 = {b, c} ▪ An association rule: {m, b} → c. ▪ Confidence = 2/4 = 50%. + _ _ + Association Rules