Uncertainty in Artificial Intelligence
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Abstraction in Belief Networks: The Role of Intermediate States in Diagnostic Reasoning
Gregory Provan
Bayesian belief networks are bing increasingly used as a knowledge representation for diagnostic reasoning. One simple method for conducting diagnostic reasoning is to represent system faults and observations only. In this paper, we investigate how having intermediate nodes-nodes other than fault and observation nodes affects the diagnostic performance of a Bayesian belief network. We conducted a series of experiments on a set of real belief networks for medical diagnosis in liver and bile disease. We compared the effects on diagnostic performance of a two-level network consisting just of disease and finding nodes with that of a network which models intermediate pathophysiological disease states as well. We provide some theoretical evidence for differences observed between the abstracted two-level network and the full network.
Pages: 464-473
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PDF Link: /papers/95/p464-provan.pdf
AUTHOR = "Gregory Provan ",
TITLE = "Abstraction in Belief Networks: The Role of Intermediate States in Diagnostic Reasoning",
BOOKTITLE = "Proceedings of the Eleventh Conference Annual Conference on Uncertainty in Artificial Intelligence (UAI-95)",
PUBLISHER = "Morgan Kaufmann",
ADDRESS = "San Francisco, CA",
YEAR = "1995",
PAGES = "464--473"

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