Cyan2 comments on No Universally Compelling Arguments - Less Wrong
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Bayesian reasoning is an "engine of accuracy" in the same why that classical logic is an engine of accuracy. Both are conditional on accepting some initial state of information. In classical logic, conclusions follow from premises; in Bayesian reasoning, posterior probability assignments follow from prior probability assignments. An argument in classical logic need not be universally compelling: you can always deny the premises. Likewise, Bayesian reasoning doesn't tell you which prior probabilities to adopt.