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Phys Rev Lett. 2007 Nov 16;99(20):204101. Epub 2007 Nov 14.

Partial mutual information for coupling analysis of multivariate time series.

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Institute of Physics, University of Greifswald, D-17487 Greifswald, Germany.


We propose a method to discover couplings in multivariate time series, based on partial mutual information, an information-theoretic generalization of partial correlation. It represents the part of mutual information of two random quantities that is not contained in a third one. By suitable choice of the latter, we can differentiate between direct and indirect interactions and derive an appropriate graphical model. An efficient estimator for partial mutual information is presented as well.

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