Bayesian Analysis

Bayesian Clustering of Functional Data Using Local Features

Adam Justin Suarez and Subhashis Ghosal

Full-text: Open access

Abstract

The use of exploratory methods is an important step in the understanding of data. When clustering functional data, most methods use traditional clustering techniques on a vector of estimated basis coefficients, assuming that the underlying signal functions live in the L2-space. Bayesian methods use models which imply the belief that some observations are realizations from some signal plus noise models with identical underlying signal functions. The method we propose differs in this respect: we employ a model that does not assume that any of the signal functions are truly identical, but possibly share many of their local features, represented by coefficients in a multiresolution wavelet basis expansion. We cluster each wavelet coefficient of the signal functions using conditionally independent Dirichlet process priors, thus focusing on exact matching of local features. We then demonstrate the method using two datasets from different fields to show broad application potential.

Article information

Source
Bayesian Anal. Volume 11, Number 1 (2016), 71-98.

Dates
First available in Project Euclid: 4 February 2015

Permanent link to this document
https://projecteuclid.org/euclid.ba/1423083640

Digital Object Identifier
doi:10.1214/14-BA925

Mathematical Reviews number (MathSciNet)
MR3447092

Zentralblatt MATH identifier
1359.62264

Keywords
Dirichlet process prior wavelets exploratory analysis

Citation

Suarez, Adam Justin; Ghosal, Subhashis. Bayesian Clustering of Functional Data Using Local Features. Bayesian Anal. 11 (2016), no. 1, 71--98. doi:10.1214/14-BA925. https://projecteuclid.org/euclid.ba/1423083640


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