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- Max Henrion
- UAI
- 1986

Qualitative Probabilistic Networks (QPNs) are an abstraction of Bayesian belief networks replacing numerical relations by qualitative innuences and synergies Wellman, 1990b]. To reason in a QPN is to nd the eeect of new evidence on each node in terms of the sign of the change in belief (increase or decrease). We introduce a polynomial time algorithm for… (More)

- Max Henrion
- UAI
- 1987

We present several techniques for knowledge engineering of large belief networks (BNs) based on the our experiences with a network derived from a large medical knowledge base. The noisy-MAX, a generalization of the noisy-OR gate, is used to model causal independence in a BN with multivalued variables. We describe the use of leak probabilities to enforce the… (More)

Despite their diierent perspectives, artiicial intelligence (AI) and the disciplines of decision science have common roots and strive for similar goals. This paper surveys the potential for addressing problems in representation, inference, knowledge engineering, and explanation within the decision-theoretic framework. Recent analyses of the restrictions of… (More)

Bayesian belief networks are being increasingly used as a knowledge representation for reasoning under uncertainty. Some researchers have questioned the practicality of obtaining the numerical probabilities with sucient precision to create belief networks for large-scale applications. In this work, we i n v estigate how precise the probabilities need to be… (More)

- Sampath Srinivas, Eric Horvitz, Ross Shachter, Yoav Shoham, Edward Feigenbaum, Yumi Iwasaki +23 others
- 1998

ii I certify that I have read this dissertation and that in my opinion it is fully adequate, in scope and in quality, a s a dissertation for the degree of Doctor of Philosophy. Richard Fikes Principal Adviser I certify that I have read this dissertation and that in my opinion it is fully adequate, in scope and in quality, a s a dissertation for the degree… (More)

Recent research has found that diagnostic performance with Bayesian belief networks is often surprisingly insensitive to imprecision in the numerical probabilities. For example, the authors have recently completed an extensive study in which they applied random noise to the numerical probabilities in a set of belief networks for medical diagnosis, subsets… (More)

- Max Henrion
- UAI
- 1991

Since exact probabilistic inference is intractable in general for large multiply connected belief nets, approximate methods are required. A promising approach is to use heuristic search among hypotheses (instantiations of the network) to find the most probable ones, as in the TopN algorithm. Search is based on the relative probabilities of hypotheses which… (More)

- Max Henrion
- UAI
- 1989