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Estimating Causal Effects from Nonparanormal Observational Data

Mahmoudi, S. M. & Wit, E. C., 21-Dec-2018, In : The international journal of biostatistics. 14, 2, 15 p., 20180030.

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One of the basic aims of science is to unravel the chain of cause and effect of particular systems. Especially for large systems, this can be a daunting task. Detailed interventional and randomized data sampling approaches can be used to resolve the causality question, but for many systems, such interventions are impossible or too costly to obtain. Recently, Maathuis et al. (2010), following ideas from Spirtes et al. (2000), introduced a framework to estimate causal effects in large scale Gaussian systems. By describing the causal network as a directed acyclic graph it is a possible to estimate a class of Markov equivalent systems that describe the underlying causal interactions consistently, even for non-Gaussian systems. In these systems, causal effects stop being linear and cannot be described any more by a single coefficient. In this paper, we derive the general functional form of a causal effect in a large subclass of non-Gaussian distributions, called the non-paranormal. We also derive a convenient approximation, which can be used effectively in estimation. We show that the estimate is consistent under certain conditions and we apply the method to an observational gene expression dataset of the Arabidopsis thaliana circadian clock system.
Original languageEnglish
Article number20180030
Number of pages15
JournalThe international journal of biostatistics
Volume14
Issue number2
Publication statusPublished - 21-Dec-2018

    Keywords

  • causal effects, directed acyclic graph (DAG), nonparanormal distribution, PC-algorithm, Gaussian copula, ARABIDOPSIS-THALIANA, REGULATORY NETWORKS, BAYESIAN-NETWORK, TIME

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