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LEAST SQUARES APPROXIMATIONS OF MEASURES VIA GEOMETRIC CONDITION NUMBERS

Part of: Classical measure theory

Published online by Cambridge University Press:  20 December 2011

Gilad Lerman  and
J. Tyler Whitehouse
Gilad Lerman
Affiliation:
School of Mathematics, University of Minnesota, 127 Vincent Hall, 206 Church St. SE, Minneapolis 55455, U.S.A. (email: lerman@umn.edu)
J. Tyler Whitehouse
Affiliation:
Department of Mathematics, Vanderbilt University, 1326 Stevenson Center, Nashville 37240, U.S.A. (email: jonathan.t.whitehouse@vanderbilt.edu)
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Abstract

For a probability measure μ on a real separable Hilbert space H, we are interested in “volume-based” approximations of the d-dimensional least squares error of μ, i.e., least squares error with respect to a best fit d-dimensional affine subspace. Such approximations are given by averaging real-valued multivariate functions which are typically scalings of squared (d+1)-volumes of (d+1)-simplices in H. Specifically, we show that such averages are comparable to the square of the d-dimensional least squares error of μ, where the comparison depends on a simple quantitative geometric property of μ. This result is a higher dimensional generalization of the elementary fact that the double integral of the squared distances between points is proportional to the variance of μ. We relate our work to two recent algorithms, one for clustering affine subspaces and the other for Monte-Carlo singular value decomposition based on volume sampling.

MSC classification

Secondary: 28A35: Measures and integrals in product spaces
Type
Research Article
Information
Mathematika , Volume 58 , Issue 1 , January 2012 , pp. 45 - 70
Copyright
Copyright © University College London 2012

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