Applications of Belief Networks

• Causal -> physical (in some sense)
  • biological
    • disease diagnosis - within one person
    • genetics - across people
  • chemistry
    • molecule shape (DENRAL)
    • lightening causes fire
  • economic
  • mechanical system (car/plane diagnosis)
  • neurological
    • hear alarm; call friend...
    • document writer uses certain words
    • Basis of HMM, e.g., for speech recognition
• Models to create probability entries
  • TF-IDF for document classification/retrieval
  • canonical distributions, e.g., noisy-OR
    • P(Fever), given Cold, Flu, Malaria
    • P(NOT(Fever)) is product of noise parameters
• BN for stochastic model of a system
  • e.g., for a game or simulation
  • is algorithm for inference: logic sampling