Wermuth Comment : Are Marginal Models Needed ?
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Binary models of marginal independence: a comparison of different approaches
Graphical models of marginal independence, introduced by Cox & Wermuth [1] with the name of covariance graph models, are also known in the literature as bidirected graph models following Richardson [6]. These models are of special interest because they belong to the families of ancestral and summary graphs; see Wermuth & Sadeghi [8] for a review. Let G = (V,E) be a bidirected graph defined by a...
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