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Nornagest comments on Belief in Belief - Less Wrong
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Comments (164)
I agree this study is a bit silly. I'll try to dig up the one I saw, but promise nothing.
Agree that the placebo effect may contain lying to doctors. There may also be some regression to the mean - people who are too healthy are excluded from the study, so when everyone moves at random the ones sick enough to be selected get healthier.
My understanding is that the studies establishing a placebo effect were controlled in a way that'd rule out regression to the mean as a cause of the perceived improvements. Lying to doctors does sound plausible, though.