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- W2962693807 abstract "The problem of estimating the directed information rate between two discrete processes ${X_{n}}$ and ${Y_{n}}$ via the plug-in (or maximum-likelihood) estimator is considered. When the joint process ${(X_{n},Y_{n})}$ is a Markov chain of a given memory length, the plug-in estimator is shown to be asymptotically Gaussian and to converge at the optimal rate $O(1/sqrt {n})$ under appropriate conditions; this is the first estimator that has been shown to achieve this rate. An important connection is drawn between the problem of estimating the directed information rate and that of performing a hypothesis test for the presence of causal influence between the two processes. Under fairly general conditions, the null hypothesis, which corresponds to the absence of causal influence, is equivalent to the requirement that the directed information rate be equal to zero. In that case, a finer result is established, showing that the plug-in converges at the faster rate $O(1/n)$ and that it is asymptotically $chi ^{2}$ -distributed. This is proved by showing that this estimator is equal to (a scalar multiple of) the classical likelihood ratio statistic for the above hypothesis test. Finally, it is noted that these results facilitate the design of an actual likelihood ratio test for the presence or absence of causal influence." @default.
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- W2962693807 date "2016-11-01" @default.
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- W2962693807 title "Estimating the Directed Information and Testing for Causality" @default.
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- W2962693807 doi "https://doi.org/10.1109/tit.2016.2604842" @default.
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