Incremental Tradeoff Resolution in Qualitative Probabilistic Networks

Chao-Lin Liu and Michael P. Wellman

Qualitative probabilistic reasoning in a Bayesian network often reveals tradeoffs: relationships that are ambiguous due to competing qualitative influences. We present two techniques that combine qualitative and numeric probabilistic reasoning to resolve such tradeoffs, inferring the qualitative relationship between nodes in a Bayesian network. The first approach incrementally marginalizes nodes in network, and the second incrementally refines the state spaces of random variables. Both provide systematic methods for tradeoff resolution at potentially lower computational cost than application of purely numeric methods.

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