10 Mar 2004
CS 3243 - Bayesian Networks
3
Bayesian networks
nA simple, graphical notation for conditional independence assertions and hence for compact specification of full joint distributions
n
nSyntax:
na set of nodes, one per variable
na directed, acyclic graph (link ≈ "directly influences")
na conditional distribution for each node given its parents:
nP (Xi | Parents (Xi))
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nIn the simplest case, conditional distribution represented as a conditional probability table (CPT) giving the distribution over Xi for each combination of parent values