Dependency structure and scaling properties of financial time series are related

Raffaello Morales, T. Di Matteo and Tomaso Aste

LSE Research Online Documents on Economics from London School of Economics and Political Science, LSE Library

Abstract: We report evidence of a deep interplay between cross-correlations hierarchical properties and multifractality of New York Stock Exchange daily stock returns. The degree of multifractality displayed by different stocks is found to be positively correlated to their depth in the hierarchy of cross-correlations. We propose a dynamical model that reproduces this observation along with an array of other empirical properties. The structure of this model is such that the hierarchical structure of heterogeneous risks plays a crucial role in the time evolution of the correlation matrix, providing an interpretation to the mechanism behind the interplay between cross-correlation and multifractality in financial markets, where the degree of multifractality of stocks is associated to their hierarchical positioning in the cross-correlation structure. Empirical observations reported in this paper present a new perspective towards the merging of univariate multi scaling and multivariate cross-correlation properties of financial time series.

JEL-codes: F3 G3 (search for similar items in EconPapers)
Date: 2014-04-04
New Economics Papers: this item is included in nep-ecm
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Citations: View citations in EconPapers (7)

Published in Scientific Reports, 4, April, 2014, 4(4589). ISSN: 2045-2322

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