Journal article

Parametrising correlation matrices

Peter J Forrester, Jiyuan Zhang

JOURNAL OF MULTIVARIATE ANALYSIS | ELSEVIER INC | Published : 2020

Abstract

Correlation matrices are the sub-class of positive definite real matrices with all entries on the diagonal equal to unity. Earlier work has exhibited a parametrisation of the corresponding Cholesky factorisation in terms of partial correlations, and also in terms of hyperspherical co-ordinates. We show how the two are related, starting from the definition of the partial correlations in terms of the Schur complement. We extend this to the generalisation of correlation matrices to the cases of complex and quaternion entries. As in the real case, we show how the hyperspherical parametrisation leads naturally to a distribution on the space of correlation matrices {R} with probability density fun..

View full abstract

University of Melbourne Researchers

Grants

Awarded by ARC grant


Funding Acknowledgements

This work is part of a research program supported by the Australian Research Council (ARC) through the ARC Centre of Excellence for Mathematical and Statistical frontiers (ACEMS). PJF also acknowledges partial support from ARC grant DP170102028, and JZ acknowledges the support of a Melbourne postgraduate award, and an ACEMS, Australia top up scholarship.