Association Analysis: Basic Concepts and Algorithms
6.2 Frequent Itemset Generation A lattice structure can be used to enumerate the list of all possible itemsets. Figure 6.1 shows an itemset lattice for I = {a,b,c,d,e}. In general, a data set that contains k items can potentially generate up to 2k −1 frequent itemsets, excluding the null set. Because k can be very large in many practical appli-
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