Milk
n
Nuts, Coffee, Diaper, Eggs, Milk
Customer
buys both
Customer
buys beer
Customer
buys diaper
Find all the rules X à Y with
minimum support and confidence
n
support, s, probability that a
transaction contains X and Y
n
confidence, c, conditional
probability that a transaction
having X also contains Y
Let minsup = 50%, minconf = 50%
Freq. Pat.: Beer:3, Nuts:3, Diaper:4, Eggs:3,
{Beer, Diaper}:3
n
Association rules: (many more!)
n
Beer à Diaper (60%, 100%)
n
Diaper à Beer…
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