Assertion: placebo's effect | /r/HasProperty | regression
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Source sentences:
text: I mean that the Cochrane review says that the Placebo effect is only in the data, and only in certain kinds of data (self-reported binary outcomes), the idea being that the placebo effect is primarily statistical effects (regression to the mean, natural progress of the disease) and reporting bias (saying what you think the surveyor wants to see) rather than a psychological or physiological effect.