Functional factorial K-means analysis

Michio Yamamoto, Yoshikazu Terada

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


A new procedure for simultaneously finding the optimal cluster structure of multivariate functional objects and finding the subspace to represent the cluster structure is presented. The method is based on the k-means criterion for projected functional objects on a subspace in which a cluster structure exists. An efficient alternating least-squares algorithm is described, and the proposed method is extended to a regularized method for smoothness of weight functions. To deal with the negative effect of the correlation of the coefficient matrix of the basis function expansion in the proposed algorithm, a two-step approach to the proposed method is also described. Analyses of artificial and real data demonstrate that the proposed method gives correct and interpretable results compared with existing methods, the functional principal component k-means (FPCK) method and tandem clustering approach. It is also shown that the proposed method can be considered complementary to FPCK.

Original languageEnglish
Pages (from-to)133-148
Number of pages16
JournalComputational Statistics and Data Analysis
Publication statusPublished - Nov 2014
Externally publishedYes


  • Cluster analysis
  • Dimension reduction
  • Functional data
  • K-means algorithm
  • Tandem analysis

ASJC Scopus subject areas

  • Statistics and Probability
  • Computational Mathematics
  • Computational Theory and Mathematics
  • Applied Mathematics


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