Direct-coupling information measure from nonuniform embedding

D. Kugiumtzis
Phys. Rev. E 87, 062918 – Published 25 June 2013

Abstract

A measure to estimate the direct and directional coupling in multivariate time series is proposed. The measure is an extension of a recently published measure of conditional mutual information from mixed embedding (MIME) for bivariate time series. In the proposed measure of partial MIME (PMIME), the embedding is on all observed variables and it is optimized in explaining the response variable. It is shown that PMIME detects correctly direct coupling and outperforms the (linear) conditional Granger causality and the partial transfer entropy. We demonstrate that PMIME does not rely on significance test and embedding parameters and the number of observed variables has no effect on its statistical accuracy; it may only slow the computations. The importance of these points is shown in simulations and in an application to epileptic multichannel scalp electroencephalograms.

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  • Received 23 November 2012

DOI:https://doi.org/10.1103/PhysRevE.87.062918

©2013 American Physical Society

Authors & Affiliations

D. Kugiumtzis*

  • Faculty of Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece

  • *dkugiu@gen.auth.gr; http://users.auth.gr/dkugiu

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Vol. 87, Iss. 6 — June 2013

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