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LizzardWizzard comments on Rationality Quotes June 2014 - Less Wrong
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Three Bayesians walk into a bar: a) what's the probability that this is a joke? b) what's the probability that one of the three is a Rabbi? c) given that one of the three is a Rabbi, what's the probability that this is a joke? (c)
According to the base rate there is an evidence that this is a joke about Russia national team or Suarez bite
And now this must become a canonical example used in logical probability papers.
Three Bayesians walk into a bar. The third one ducks
Now I'm trying to figure out if your missing period is part of the joke.
This seems to be the original source, as far as I can tell: https://twitter.com/rickasaurus/status/471930220782448641
Wait this is actually brilliant in a couple of ways, because to get the right (estimated) answer, the listener has to distinguish between probability that one of the three is a rabbi and this is a joke, and probability that this is a joke if we put the probability of the third being a rabbi at 100%.
It follows the setup of a rationality calibration question while subverting it and rendering "guessing the teacher's password" useless, since c) is (maybe) higher than a) or b)