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# Lect19 - Course Logistics Happy Election Day Were still...

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Course Logistics Happy Election Day! We’re still working on MP1… The MP was intractably difficult Instead, HW4 on BNs was posted on the web site yesterday; it is due a week from today.

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BN Construction Identify variables Order them* While there are variables to add Pick the next in the ordering Identify its parents in the net Hold all others constant (in every configuration) If net variable influences it, net var is a parent Draw all arcs and add CPT * order matters a lot
Dentist Example A C B 3 Boolean Random Variables: C Patient has a cavity A Patient reports a toothache B – Dentist’s probe catches on tooth

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Order: C A B A C B A C B A C B Order: A B C Order: B C A 5 parameters 7 parameters no savings over the joint 5 parameters Effect of Order on BN structure
BN Structure consider ordering M,J,E,B,A B a burglary is in progress E an earthquake is in progress A the alarm is sounding J John calls M Mary calls J A M E B All variables are Boolean How many numbers?

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Lect19 - Course Logistics Happy Election Day Were still...

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