hairyfigment comments on Stupid Questions May 2015 - Less Wrong Discussion
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How do we determine our "hyper-hyper-hyper-hyper-hyperpriors"? Before updating our priors however many times, is there any way to calculate the probability of something before we have any data to support any conclusion?
No, practical Bayesian probability starts with an attempt to represent your existing beliefs and make them self-consistent. For a brief post on the more abstract problem, see here.