Prove Equation 6.3. (Hint: First, count the number of ways to create an itemset that forms the left hand side of the rule. Next, for each size k itemset selected for the left-hand side, count the number of ways to choose the remaining d ? k items to form the right-hand side of the rule.)
What will be an ideal response?
Answer:
Suppose there are d items. We first choose k of the items to form the left-
hand side of the rule. There are
d
k
ways for doing this. After selecting the
items for the left-hand side, there are
d?k
i
ways to choose the remaining
items to form the right hand side of the rule, where 1 ? i ? d ? k. Therefore
the total number of rules (R) is:
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