buybuydandavis comments on Does Evidence Have To Be Certain? - Less Wrong Discussion
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For any bit of evidence E0, you can always back it out based on E1,E2...
As P(E0|E1,E2,...)
Analysis starts in some context of belief. You can question bits of "evidence", and do a finer analysis, but the goal is usually to get a good answer, not reevaluate all your premises.
You need to be certain enough for the analysis at hand.