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research article

A Wasserstein-based measure of conditional dependence

Etesami, Jalal  
•
Zhang, Kun
•
Kiyavash, Negar  
June 25, 2022
Behaviormetrika

Measuring conditional dependencies among the variables of a network is of great interest to many disciplines. This paper studies some shortcomings of the existing dependency measures in detecting direct causal influences or their lack of ability for group selection to capture strong dependencies and accordingly introduces a new statistical dependency measure to overcome them. This measure is inspired by Dobrushin’s coefficients and based on the fact that there is no dependency between X and Y given another variable Z, if and only if the conditional distribution of Y given 𝑋=𝑥 and 𝑍=𝑧 does not change when X takes another realization 𝑥′ while Z takes the same realization z. We show the advantages of this measure over the related measures in the literature. Moreover, we establish the connection between our measure and the integral probability metric (IPM) that helps to develop estimators of the measure with lower complexity compared to other relevant information theoretic-based measures. Finally, we show the performance of this measure through numerical simulations.

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Type
research article
DOI
10.1007/s41237-022-00170-2
Author(s)
Etesami, Jalal  
Zhang, Kun
Kiyavash, Negar  
Date Issued

2022-06-25

Published in
Behaviormetrika
Volume

49

Issue

2

Start page

343

End page

362

Subjects

Conditional dependence measure

•

Causality

•

Wasserstein

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
BAN  
Available on Infoscience
March 15, 2023
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/196136
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