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- W2066435331 abstract "K-means is a partitional clustering technique that is well-known and widely used for its low computational cost. The representative algorithms include the hard k-means and the fuzzy k -means. However, the performance of these algorithms tends to be affected by skewed data distributions, i.e., imbalanced data. They often produce clusters of relatively uniform sizes, even if input data have varied cluster sizes, which is called the “uniform effect.” In this paper, we analyze the causes of this effect and illustrate that it probably occurs more in the fuzzy k-means clustering process than the hard k-means clustering process. As the fuzzy index m increases, the “uniform effect” becomes evident. To prevent the effect of the “uniform effect,” we propose a multicenter clustering algorithm in which multicenters are used to represent each cluster, instead of one single center. The proposed algorithm consists of the three subalgorithms: the fast global fuzzy k -means, Best M-Plot, and grouping multicenter algorithms. They will be, respectively, used to address the three important problems: 1) How are the reliable cluster centers from a dataset obtained? 2) How are the number of clusters which these obtained cluster centers represent determined? 3) How is it judged as to which cluster centers represent the same clusters? The experimental studies on both synthetic and real datasets illustrate the effectiveness of the proposed clustering algorithm in clustering balanced and imbalanced data." @default.
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- W2066435331 date "2012-08-01" @default.
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- W2066435331 title "The $K$-Means-Type Algorithms Versus Imbalanced Data Distributions" @default.
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- W2066435331 doi "https://doi.org/10.1109/tfuzz.2011.2182354" @default.
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