Emile comments on But Somebody Would Have Noticed - Less Wrong

36 Post author: Alicorn 04 May 2010 06:56PM

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Comment author: Emile 05 May 2010 08:23:55AM 4 points [-]

P(you heard about someone noticing|it's true) = P(you would have heard someone noticed|someone noticed) * P(someone noticed|it's true)

The problem with the way a lot of people use that is that they compute P(someone noticed|it's true) using someone="anybody on earth", and P(you would have heard someone noticed|someone noticed) using someone="anyone among people they know well enough to talk about that".

Comment author: NancyLebovitz 05 May 2010 11:11:34AM 1 point [-]

Also "someone would have noticed" isn't the same thing as "someone would have noticed and talked about".