Uncertainty in Artificial Intelligence
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Deciding Morality of Graphs is NP-complete
Tom Verma, Judea Pearl
In order to find a causal explanation for data presented in the form of covariance and concentration matrices it is necessary to decide if the graph formed by such associations is a projection of a directed acyclic graph (dag). We show that the general problem of deciding whether such a dag exists is NP-complete.
Pages: 391-399
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PDF Link: /papers/93/p391-verma.pdf
AUTHOR = "Tom Verma and Judea Pearl",
TITLE = "Deciding Morality of Graphs is NP-complete",
BOOKTITLE = "Proceedings of the Ninth Conference Annual Conference on Uncertainty in Artificial Intelligence (UAI-93)",
PUBLISHER = "Morgan Kaufmann",
ADDRESS = "San Francisco, CA",
YEAR = "1993",
PAGES = "391--399"

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