In different fields of physical research, we often meet the problem of distinguishing between bidirectional and unidirectional couplings of oscillatory systems, i.e., mutual influence and one-way influence, on the basis of the observed time series. In this work, it is shown that a widely used approach, based on the calculation of prediction errors of empirical models (Granger causality), may give spurious conclusions on bidirectional coupling if a sampling interval exceeds a certain intrinsic time scale of the studied systems. Taking this effect into account, we propose and illustrate by standard examples a statistical test which allows one to reveal bidirectional coupling with specified confidence probability.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 55, Nos. 10–11, pp. 736–750, October–November 2012.
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Smirnov, D.A., Bezruchko, B.P. Revealing mutual influence of oscillatory systems from the observation data. Radiophys Quantum El 55, 662–675 (2013). https://doi.org/10.1007/s11141-013-9404-6
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DOI: https://doi.org/10.1007/s11141-013-9404-6