Dependency structure and scaling properties of financial time series are related

Morales, Raffaello, Di Matteo, T. and Aste, Tomaso (2014) Dependency structure and scaling properties of financial time series are related. Scientific Reports, 4 (4589). ISSN 2045-2322

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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.

Item Type:	Article
Official URL:	http://www.nature.com/srep/index.html
Additional Information:	© 2014 Rights Managed by Nature Publishing Group © CC BY 3.0
Divisions:	Financial Markets Group
Subjects:	H Social Sciences > HG Finance
Date Deposited:	01 May 2014 12:41
Last Modified:	17 Oct 2024 16:28
Projects:	ES/K002309/1
Funders:	Economic and Social Research Council
URI:	http://eprints.lse.ac.uk/id/eprint/56622

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