Evolution of worldwide stock markets, correlation structure and correlation based graphs
AbstractWe investigate the daily correlation present among market indices of stock exchanges located all over the world in the time period Jan 1996 - Jul 2009. We discover that the correlation among market indices presents both a fast and a slow dynamics. The slow dynamics reflects the development and consolidation of globalization. The fast dynamics is associated with critical events that originate in a specific country or region of the world and rapidly affect the global system. We provide evidence that the short term timescale of correlation among market indices is less than 3 trading months (about 60 trading days). The average values of the non diagonal elements of the correlation matrix, correlation based graphs and the spectral properties of the largest eigenvalues and eigenvectors of the correlation matrix are carrying information about the fast and slow dynamics of correlation of market indices. We introduce a measure of mutual information based on link co-occurrence in networks, in order to detect the fast dynamics of successive changes of correlation based graphs in a quantitative way.
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Bibliographic InfoPaper provided by arXiv.org in its series Papers with number 1103.5555.
Date of creation: Mar 2011
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Publication status: Published in Physical Review E 84 (2), 026108 (2011)
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Web page: http://arxiv.org/
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- NEP-ALL-2011-04-09 (All new papers)
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