Abstract
We investigate an association between a power-law relationship of constituents’ flows (mean versus standard deviation) and their covariance matrix on a directed bipartite network. We propose a Poisson mixture model and a method to infer states of the constituents’ flows on such a bipartite network from empirical observation without a priori knowledge on the network structure. By using a proposed parameter estimation method with high frequency financial data we found that the scaling exponent and simultaneous cross-correlation matrix have a positive correspondence relationship. Consequently we conclude that the scaling exponent tends to be 1/2 in the case of desynchronous (specific dynamics is dominant), and to be 1 in the case of synchronous (common dynamics is dominant).
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Sato, AH., Hayashi, T. Fluctuation scaling and covariance matrix of constituents’ flows on a bipartite graph. Eur. Phys. J. B 76, 529–535 (2010). https://doi.org/10.1140/epjb/e2010-00252-9
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DOI: https://doi.org/10.1140/epjb/e2010-00252-9