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Eigen Selection in Spectral Clustering: A Theory-Guided Practice

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  • Xiao Han
  • Xin Tong
  • Yingying Fan

Abstract

Based on a Gaussian mixture type model of K components, we derive eigen selection procedures that improve the usual spectral clustering algorithms in high-dimensional settings, which typically act on the top few eigenvectors of an affinity matrix (e.g., X⊤X ) derived from the data matrix X . Our selection principle formalizes two intuitions: (i) eigenvectors should be dropped when they have no clustering power; (ii) some eigenvectors corresponding to smaller spiked eigenvalues should be dropped due to estimation inaccuracy. Our selection procedures lead to new spectral clustering algorithms: ESSC for K = 2 and GESSC for K > 2. The newly proposed algorithms enjoy better stability and compare favorably against canonical alternatives, as demonstrated in extensive simulation and multiple real data studies. Supplementary materials for this article are available online.

Suggested Citation

  • Xiao Han & Xin Tong & Yingying Fan, 2023. "Eigen Selection in Spectral Clustering: A Theory-Guided Practice," Journal of the American Statistical Association, Taylor & Francis Journals, vol. 118(541), pages 109-121, January.
    • Handle: RePEc:taf:jnlasa:v:118:y:2023:i:541:p:109-121
    DOI: 10.1080/01621459.2021.1917418
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