VAuroch comments on Open thread, 24-30 March 2014 - Less Wrong Discussion
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Which implied prior? My understanding is that the problem with Multiverse theories is that we don't have a way to assign probability measures to the different possible universes, and therefore we cannot formulate an unambiguous prior distribution.
The two usual implied prior taken from Level IV are a)that every possible universe is equally likely and b)that universe are likely in direct proportion to the simplicity of their description. Some attempts have been made to show that the second falls out of the first.