Using Reduced Minimum Support at Lower Levels. Each level of abstraction has its own minimum support threshold. The lower the abstraction level, the smaller the corresponding threshold. For mining multiple level associations with reduced support, there are numbers of alternative search strategies:
– Level by level independent. This is a full breadth search, where no background knowledge of frequent itemsets is used for prunting.
– Level cross-filtering by single item. An item at the ith level is examined if and only if parent node at the (i − 1)th level is frequent.
– Level cross-filtering by k-itemset. A k-itemset at the ithlevel is examined if and only if its corresponding parent k-itemsets at the (i − 1)th level is frequent.
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