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Title: Explorando a técnica de indexação de conjuntos candidatos na mineração de conjuntos freqüentes
Other Titles: Exploring direct counting for frequent itemset mining
Keywords: Ciência da computação;  Processo de mineração de dados;  Regras de associação relacionais;  Computer science
Abstract: During the last ten years, many algorithms have been proposed to mine frequent itemsets. In order to fairly evaluate their behavior, the IEEE/ICDM Workshop on Frequent Itemset Mining Implementations (FIMI03) has been recently organized. According to its analysis, kDCI++ is a state-of-the-art algorithm. However, it can be observed from the FIMI 03 experiments that its efficient behavior does not occur for low minimum supports on sparse databases. Aiming at improving kDCI++ and making it even more competitive, we present the kDCI-3 algorithm. This proposal directly accesses candidates not only in the two initial iterations but specially in the third one, which represents, in general, the highest computational cost of kDCI++ for low minimum supports. Results have shown that kDCI-3 outperforms kDCI++ in the conducted experiments. When compared to other important algorithms, kDCI-3 enlarged the number of times kDCI++ presented the best behavior.
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