Volume 132, Number 5, December 2020
|Number of page(s)||7|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||11 January 2021|
Mapping coupled time-series onto a complex network
1 Department of Financial Management, Shahid Beheshti University - G.C., Evin, Tehran 19839, Iran
2 Center for Complex Networks and Social Data Science, Department of Physics, Shahid Beheshti University G.C., Evin, Tehran, 19839, Iran
3 Department of Physics, Shahid Beheshti University - G.C., Evin, Tehran, 19839, Iran
4 Department of Physics, University of Zanjan (ZNU) - Zanjan, 45371-38791, Iran
5 Instituto de Física Interdisciplinary Sistemas Complejos IFISC (CSIC- UIB) - Palma de Mallorca, E-07122, Spain
6 Faculty of Business Administration, Memorial University - St. John's, Canada
7 IQSCS - Leicester, UK
Received: 26 April 2020
Accepted: 4 November 2020
In order to extract hidden joint information from two possibly uncorrelated time-series, we explored the measures of network science. Alongside common methods in time-series analysis of the economic markets, the mapping joint structure of two time-series onto a network provides insight into hidden aspects embedded in the couplings. We quantise the amplitude of two time-series and investigate relative simultaneous locations of those amplitudes. Each segment of a quantised amplitude is considered as a node. The simultaneity of the amplitudes of the two time-series is considered as the links in the network. The frequency of occurrences forms the weighted links. In order to extract information, we need to measure to what extent the coupling deviates from the coupling of two uncoupled series. Also, we need to measure to what extent the couplings inherit their charachteristics from a Gaussian distribution or a non-Gaussian distribution. We mapped the network from two surrogate time-series. The results show that the couplings of markets possess some features which diverge from the same features of the network mapped from white noise, and from the network mapped from two surrogate time-series. These deviations prove that there exist joint information and cross-correlation therein. By applying network's topological and statistical measures and the deformation ratio in joint probability distribution, we distinguished basic structures of cross-correlation and coupling of cross-markets. It was discovered that even two possibly known uncorrelated markets may possess some joint patterns with each other. Thereby, those markets should be examined as coupled and weakly coupled markets.
PACS: 89.75.Hc – Networks and genealogical trees / 95.75.Wx – Time series analysis, time variability / 89.65.Gh – Economics; econophysics, financial markets, business and management
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