benelliott comments on Confidence levels inside and outside an argument - Less Wrong

129 Post author: Yvain 16 December 2010 03:06AM

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Comment author: Will_Newsome 16 December 2010 03:23:08AM 20 points [-]

Note that someone just gave a confidence level of 10^4478296 to one and was wrong. This is the sort of thing that should never ever happen. This is possibly the most wrong anyone has ever been.

I was in some discussion at SIAI once and made an estimate that ended up being off by something like three hundred trillion orders of magnitude. (Something about giant look-up tables, but still.) Anyone outdo me?

Comment author: Isaac 16 December 2010 03:49:19PM 9 points [-]

Surely declaring "x is impossible", before witnessing x, would be the most wrong you could be?

Comment author: benelliott 16 December 2010 05:54:19PM 8 points [-]

The colloquial meaning of "x is impossible" is probably closer to "x has probability <0.1%" than "x has probability 0"

Comment author: Thomas 16 December 2010 06:45:46PM 0 points [-]

Probability zero and impossibility are not exactly the same thing. A possible event can have the probability 0. But an impossible event has the probability 0.

Comment author: benelliott 16 December 2010 06:51:58PM *  6 points [-]

You are referring to the mathematical definition of impossibility, and I am well aware of the fact that it is different from probability zero (flipping a coin forever without getting tails has probability zero but is not mathematically impossible). My point is that neither of those is actually what most people (as opposed to mathematicians and philosophers) mean by impossible.