edderic.github.io's People
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cadrev penumbram-zz spinachr mandyzhangxy bharadwaj509 azharirahmann riksameidy zhacheny kietvo bingqingliu trangdoan982 cuevas072edderic.github.io's Issues
Exercise 1.5 incorrect
The solution to 1.5, the 'Secret Government Agency' question doesn't look correct. It is assuming that only one person is scanned. The question is asking something more complex, it must be taken into account that the person scanned is the first positive scan amongst the 100 people on the plane. So must incorporate into Bayes the information gained by knowing that all previous scans came back negative.
Question 1.18 Possibly wrong inference
Sally hears from the conversation that the person being discussed hates sushi and drives a white car.
p(sushi=false)=1.0
p(sushi=true)=0.0
p(car=white)=1.0
p(car≠white)=0.0
I believe the correct thing is actually:
p(sushi=false|People)=1.0
p(car=white|People)=1.0
Then
p(sushi, car|People)
false | true | P(sushi, car=x | People) | |
---|---|---|---|
white | 1 | ||
black | 0 | ||
P(sushi=y, car | People) | 0 | 1 |
That implies
false | true | P(sushi, car=x given People) | |
---|---|---|---|
white | 0 | 1 | 1 |
black | 0 | 0 | 0 |
P(sushi=y, car | People) | 0 | 1 |
Then
sushi ⊥⊥ car | People
Now is possible use:
p(car=white, sushi=false∣person=Alice) = p(car=white∣person=Alice) p(sushi=false∣person=Alice)
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