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Estimating linear dependence between nonstationary time series using the locally stationary wavelet model

Sanderson, Jean, Fryzlewicz, Piotr and Jones, M. W. (2010) Estimating linear dependence between nonstationary time series using the locally stationary wavelet model. Biometrika, 97 (2). pp. 435-446. ISSN 0006-3444

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Abstract

Large volumes of neuroscience data comprise multiple, nonstationary electrophysiological or neuroimaging time series recorded from different brain regions. Accurately estimating the dependence between such neural time series is critical, since changes in the dependence structure are presumed to reflect functional interactions between neuronal populations. We propose a new dependence measure, derived from a bivariate locally stationary wavelet time series model. Since wavelets are localized in both time and scale, this approach leads to a natural, local and multi-scale estimate of nonstationary dependence. Our methodology is illustrated by application to a simulated example, and to electrophysiological data relating to interactions between the rat hippocampus and prefrontal cortex during working memory and decision making.

Item Type: Article
Official URL: http://biomet.oxfordjournals.org/
Additional Information: © 2010 Biometrika Trust
Library of Congress subject classification: Q Science > QH Natural history > QH301 Biology
H Social Sciences > HA Statistics
Sets: Departments > Statistics
Rights: http://www.lse.ac.uk/library/usingTheLibrary/academicSupport/OA/depositYourResearch.aspx
Identification Number: UT ISI:000280559700013
Date Deposited: 27 Aug 2010 13:50
URL: http://eprints.lse.ac.uk/29141/

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