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# (PART) 真實世界數據 Real World Data and Real World Evidence {-}
# Rationale behind and challenges to health data analysis
> On its face Bayes' rule is a simple, one-line theorem: by updating our initial belief about something with objective new information, we get a new and improved belief. To its adherents, this is an elegant statement about learning from experience.
> ~ McGrayne, Sharon Bertsch from "The Theory That Would Not Die: How Bayes' Rule Cracked the Enigma Code, Hunted Down Russian Submarines, and Emerged Triumphant from Two Centuries of Controversy"[@McGrayne2011]