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Revisiting agglomerative clustering

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  • Tokuda, Eric K.
  • Comin, Cesar H.
  • Costa, Luciano da F.

Abstract

Hierarchical agglomerative methods stand out as particularly effective and popular approaches for clustering data. Yet, these methods have not been systematically compared regarding the important issue of false positives while searching for clusters. A model of clusters involving a higher density nucleus surrounded by a transition, followed by outliers is adopted as a means to quantify the relevance of the obtained clusters and address the problem of false positives. Six traditional methodologies, namely the single, average, median, complete, centroid and Ward’s linkage criteria are compared with respect to the adopted model. Unimodal and bimodal datasets obeying uniform, gaussian, exponential and power-law distributions are considered for this comparison. The obtained results include the verification that many methods detect two clusters in unimodal data. The single-linkage method was found to be more resilient to false positives. Also, several methods detected clusters not corresponding directly to the nucleus.

Suggested Citation

  • Tokuda, Eric K. & Comin, Cesar H. & Costa, Luciano da F., 2022. "Revisiting agglomerative clustering," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 585(C).
    • Handle: RePEc:eee:phsmap:v:585:y:2022:i:c:s0378437121007068
    DOI: 10.1016/j.physa.2021.126433
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    References listed on IDEAS

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