Matrix Moments in a Real, Doubly Correlated Algebraic Generalization of the Wishart Model
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Publication:6353781
DOI10.1088/1751-8121/ABE428zbMATH Open1519.60011arXiv2011.07573MaRDI QIDQ6353781
[[Person:6081976|Author name not available (Why is that?)]], T. Guhr
Publication date: 15 November 2020
Abstract: The Wishart model of random covariance or correlation matrices continues to find ever more applications as the wealth of data on complex systems of all types grows. The heavy tails often encountered prompt generalizations of the Wishart model, involving algebraic distributions instead of a Gaussian. The mathematical properties pose new challenges, particularly for the doubly correlated versions. Here we investigate such a doubly correlated algebraic model for real covariance or correlation matrices. We focus on the matrix moments and explicitly calculate the first and the second one, the computation of the latter is non-trivial. We solve the problem by relating it to the Aomoto integral and by extending the recursive technique to calculate Ingham-Siegel integrals. We compare our results with the Gaussian case.
Measures of association (correlation, canonical correlation, etc.) (62H20) Random matrices (probabilistic aspects) (60B20) Random matrices (algebraic aspects) (15B52)
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