Journal Article

Independent Component Analysis via Distance Covariance

Matteson, David S., Tsay, Ruey S.

2017

Overview

This article introduces a novel statistical framework for independent component analysis (ICA) of multivariate data. We propose methodology for estimating mutually independent components, and a versatile resampling-based procedure for inference, including misspecification testing. Independent components are estimated by combining a nonparametric probability integral transformation with a generalized nonparametric whitening method based on distance covariance that simultaneously minimizes all forms of dependence among the components. We prove the consistency of our estimator under minimal regularity conditions and detail conditions for consistency under model misspecification, all while placing assumptions on the observations directly, not on the latent components. U statistics of certain Euclidean distances between sample elements are combined to construct a test statistic for mutually independent components. The proposed measures and tests are based on both necessary and sufficient conditions for mutual independence. We demonstrate the improvements of the proposed method over several competing methods in simulation studies, and we apply the proposed ICA approach to two real examples and contrast it with principal component analysis.

• Publisher: Taylor & Francis,Taylor & Francis Group,LLC,Taylor & Francis Ltd
• Subject: Analysis of covariance / Components / Consistency / Covariance / Independent component analysis / Inference / Integral transforms / Misspecification testing / Multivariate analysis / Mutual independence test / Nonparametric statistics / Principal component analysis / Principal components analysis / probability / Resampling / Simulation / Statistical analysis / Statistics / Tests / Theory and Methods / Transformation / U statistics