Functional Cluster Analysis via Orthonormalized Gaussian Basis Expansions and Its Application |
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Authors: | Mitsunori Kayano Koji Dozono Sadanori Konishi |
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Institution: | (1) Department of Statistics, Texas A&M University, College Station, TX 77845-3143, USA |
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Abstract: | We propose functional cluster analysis (FCA) for multidimensional functional data sets, utilizing orthonormalized Gaussian
basis functions. An essential point in FCA is the use of orthonormal bases that yield the identity matrix for the integral
of the product of any two bases. We construct orthonormalized Gaussian basis functions using Cholesky decomposition and derive
a property of Cholesky decomposition with respect to Gram-Schmidt orthonormalization. The advantages of the functional clustering
are that it can be applied to the data observed at different time points for each subject, and the functional structure behind
the data can be captured by removing the measurement errors. Numerical experiments are conducted to investigate the effectiveness
of the proposed method, as compared to conventional discrete cluster analysis. The proposed method is applied to three-dimensional
(3D) protein structural data that determine the 3D arrangement of amino acids in individual protein. |
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