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Clustering and Geodesic Scaling of Dissimilarities on the Spherical Surface

Author

Listed:
  • J. Fernando Vera

    (University of Granada)

  • Ricardo Subiabre

    (Centro de Docencia Superior en Ciencias Básicas, Universidad Austral de Chile)

  • Rodrigo Macías

    (Centro de Investigación en Matemáticas, Unidad de Monterrey)

Abstract

Spherical embedding is an important tool in several fields of data analysis, including environmental data, spatial statistics, text mining, gene expression analysis, medical research and, in general, areas in which the geodesic distance is a relevant factor. Many data acquisition technologies are related to massive data acquisition, and these high-dimensional vectors are often normalised and transformed into spherical data. In this representation of data on spherical surfaces, multidimensional scaling plays an important role. Traditionally, the methods of clustering and representation have been combined, since the precision of the representation tends to decrease when a large number of objects are involved, which makes interpretation difficult. In this paper, we present a model that partitions objects into classes while simultaneously representing the cluster centres on a spherical surface based on geodesic distances. The model combines a partition algorithm based on the approximation of dissimilarities to geodesic distances with a representation procedure for geodesic distances. In this process, the dissimilarities are transformed in order to optimise the radius of the sphere. The efficiency of the procedure described is analysed by means of an extensive Monte Carlo experiment, and its usefulness is illustrated for real data sets. Supplementary material to this paper is provided online.

Suggested Citation

  • J. Fernando Vera & Ricardo Subiabre & Rodrigo Macías, 2025. "Clustering and Geodesic Scaling of Dissimilarities on the Spherical Surface," Journal of Agricultural, Biological and Environmental Statistics, Springer;The International Biometric Society;American Statistical Association, vol. 30(1), pages 172-192, March.
  • Handle: RePEc:spr:jagbes:v:30:y:2025:i:1:d:10.1007_s13253-023-00597-4
    DOI: 10.1007/s13253-023-00597-4
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