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Dormant independence

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The construction of causal graphs from non-experimental data rests on a set of constraints that the graph structure imposes on all probability distributions compatible with the graph. These constraints are of two types: conditional independencies and algebraic constraints, first noted by Verma. While conditional independencies are well studied and frequently used in causal induction algorithms, Verma constraints are still poorly understood, and rarely applied. This paper examines a special subset of Verma constraints which are easy to understand, easy to identify and easy to apply; they arise from dormant independencies, namely, conditional independencies that hold in interventional distributions. A complete algorithm is given for determining if a dormant independence between two sets of variables is entailed by the causal graph, such that this independence is identifiable, in other words if it resides in an interventional distribution that can be predicted without resorting to interventions. The usefulness of dormant independencies is shown in model testing and induction by giving an algorithm that uses constraints entailed by dormant independencies to prune extraneous edges from a given causal graph.

‘Dormant independence’, I. Shpitset and J. Pearl, UCLA Cognitive Systems Laboratory, Technical Report (R-340), April 2008. In Proceedings of the Twenty-Third Conference on Artificial Intelligence, 1081-1087, 2008 http://bayes.cs.ucla.edu/csl_papers.html

This talk is part of the Causal Inference Seminar and Discussion Group series.

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