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On Quantifying and Estimating Directed Dependence

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Book cover Building Bridges between Soft and Statistical Methodologies for Data Science (SMPS 2022)

Part of the book series: Advances in Intelligent Systems and Computing ((AISC,volume 1433))

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Abstract

Considering that a (random) variable X may provide more information about a (random) variable Y than vice versa it is natural that dependence measures, i.e., notions quantifying the extent of dependence, are not necessarily symmetric. Working with Markov kernels (regular conditional distributions) allows to construct the measure which assigns every copula a value in [0, 1], which is 0 exactly in the case of independence, and 1 exclusively for Y being a function of X. More importantly, given samples of X and Y and considering so-called checkerboard estimators it is possible to derive a strongly consistent estimator for the dependence measure which also exhibits a good performance for small and medium sample sizes. After sketching the background on the dependence measure and its checkerboard estimator, and illustrating its performance in terms of a small simulation study we discuss how the studied approach can be generalized to the multivariate question of quantifying the extent of dependence of a random variable Y on an ensemble of random variables.

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Acknowledgements

The first author gratefully acknowledges the support of the WISS 2025 project ‘IDA-lab Salzburg’ (20204-WISS/225/197-2019 & 20102-F1901166-KZP), the second author gratefully acknowledge the support of the Austrian FWF START project Y1102 ‘Successional Generation of Functional Multidiversity’.

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Correspondence to Wolfgang Trutschnig .

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Trutschnig, W., Griessenberger, F. (2023). On Quantifying and Estimating Directed Dependence. In: García-Escudero, L.A., et al. Building Bridges between Soft and Statistical Methodologies for Data Science . SMPS 2022. Advances in Intelligent Systems and Computing, vol 1433. Springer, Cham. https://doi.org/10.1007/978-3-031-15509-3_50

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