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Stuart_Armstrong comments on Monty Hall Sleeping Beauty - Less Wrong Discussion

1 Post author: PhilGoetz 18 September 2015 09:18PM

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Comment author: Stuart_Armstrong 18 September 2015 10:13:26PM 3 points [-]

In my video here I look at a lot of the ramifications of SB decisions: https://www.youtube.com/watch?v=aiGOGkBiWEo

What's relevant here is the frequentist position. Imagine you do the SB experiment a thousand times in a row. If you tell SB "be correct the most often you are asked", she will behave as a thirder. If you tell SB "be correct in the most experiments", then she will behave as a halfer. So frequentism no longer converges to a unique subjective probability in the long run.

Comment author: PhilGoetz 19 September 2015 01:07:51AM 5 points [-]

No; you are asking her two different questions, so it is correct for frequentism to give different answers to the different questions.

Comment author: Stuart_Armstrong 21 September 2015 09:17:31AM *  1 point [-]

Of course. But the two questions are the same outside of anthropic situations; they are two extensions of the underdefined "how often was I right?" Or, if you prefer, the frequentist answer in anthropic situations is dependent on the exact question asked, showing that "anthropic probability" is not a well defined concept.