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Applying the Gradient Projection Method to a Model of Proportional Membership for Fuzzy Cluster Analysis

In: Optimization and Its Applications in Control and Data Sciences

Author

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  • Susana Nascimento

    (Universidade Nova de Lisboa)

Abstract

This paper presents a fuzzy proportional membership model for clustering (FCPM). Unlike the other clustering models, FCPM requires that each entity may express an extent of each prototype, which makes its criterion to loose the conventional prototype-additive structure. The methods for fitting the model at different fuzziness parameter values are presented. Because of the complexity of the clustering criterion, minimization of the errors requires the gradient projection method (GPM). We discuss how to find the projection of a vector on the simplex of the fuzzy membership vectors and how the stepsize length of the GPM had been fixed. The properties of the clusters found with the FCPM are discussed. Especially appealing seems the property to keep the extremal cluster prototypes stable even after addition of many entities around the grand mean.

Suggested Citation

  • Susana Nascimento, 2016. "Applying the Gradient Projection Method to a Model of Proportional Membership for Fuzzy Cluster Analysis," Springer Optimization and Its Applications, in: Boris Goldengorin (ed.), Optimization and Its Applications in Control and Data Sciences, pages 353-380, Springer.
    • Handle: RePEc:spr:spochp:978-3-319-42056-1_13
    DOI: 10.1007/978-3-319-42056-1_13
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