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Math Help - [SOLVED] Bayes Network Theorem

  1. #1
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    May 2009
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    [SOLVED] Bayes Network Theorem

    I am struggling to calculate the ratios for converging connections in bayesian networks.
    For example...

    TBoC ---> D <--- B

    This is modelled by the formula, p(D | TBoC, B).

    When the TBoc and D are instantiated... p(D = yes | TBoC = yes | B),
    The likelihood ratio is 90:70.
    and the Priors of B are true: 45% and false: 55%.

    I know the answers I am looking for are 51.266% and 43.734%, but I just can't seem to work out how to do this!

    How do I work out the change in chances of the patient having Bronchitis?

    Looking forward to any help,
    Thanks.
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  2. #2
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    May 2009
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    I've solved this. Thanks anyway.
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