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Many approaches have been proposed for mining fuzzy association rules. The membership functions, which critically influence the final mining results, are difficult to de ne. In general, multiple criteria are considered when defining membership functions. In this paper, a multi-objective genetic-fuzzy mining algorithm is proposed for extracting membership functions and association rules from quantitative transactions. Two objective functions are used to find the Pareto front. The first one is the suitability of membership functions. It consists of the coverage factor and the overlap factor and is used to avoid two unsuitable types of membership function. The second one is the total number of large 1-itemsets from a given set of minimum support values.
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