I think there is an error in chapter 6.. In page 133, to calculate that Norman is late in order to calculate the marginal, the equation there is
P(N=true) = P(N=TrueT=True) P(T=True) + P(N=TrueT=False) P(N=TrueT=False) This last part P(N=TrueT=False) = .2 but in the solution its equals to .9, the right answer which is P(N=FalseT=False) ?? I think from my understand that the number is right for this equation but the equation is probably mistyped. Thanks and best regards, Bayan 
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Bayan I'm away until Tuesday so will not have a chance to look at this until then. But thanks for pointing this out  I will post a correction on the web page once I have checked it. Norman Fenton Sent from my iPhone On 9 Feb 2013, at 15:19, "Bayan AlMutawa [via Risk Assessment with Bayesian Networks]" <[hidden email]> wrote:

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In reply to this post by Bayan AlMutawa
Bayan
I have now added this to the Errata page http://www.bayesianrisk.com/errata.html with an acknowledgement to you for poiting it out. Norman Fenton > I think there is an error in chapter 6.. In page 133, to calculate that > Norman is late in order to calculate the marginal, the equation there is > P(N=true) = P(N=TrueT=True) P(T=True) + P(N=TrueT=False) > P(N=TrueT=False) > This last part P(N=TrueT=False) = .2 but in the solution its equals to > .9, the right answer which is P(N=FalseT=False) ?? I think from my > understand that the number is right for this equation but the equation > is probably mistyped. > > Thanks and best regards, > Bayan > > >  > If you reply to this email, your message will be added to the discussion > below: > http://riskassessmentwithbayesiannetworks.2318783.n4.nabble.com/Errorinpage133tp9.html > > To start a new topic under Risk Assessment with Bayesian Networks, email > [hidden email] > To unsubscribe from Risk Assessment with Bayesian Networks, click here > < > NAML > <http://riskassessmentwithbayesiannetworks.2318783.n4.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespacenabble.view.web.template.NabbleNamespacenabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.namlinstant_emails%21nabble%3Aemail.namlsend_instant_email%21nabble%3Aemail.naml> > 
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