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Basic Concepts: Frequent Patterns

  • itemset: A set of one or more items
  • k-itemset X = {x1, …, xk}
  • (absolute) support, or, support count of X: Frequency or occurrence of an itemset X
  • (relative) support, s, is the fraction of transactions that contains X (i.e., the probability that a transaction contains X)
  • An itemset X is frequent if X’s support is no less than a minsup threshold

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