There's plenty of evidence, but probably not for 'works' in the sense the GP meant. https://en.wikipedia.org/wiki/Regression_toward_the_mean https://en.wikiped

There's plenty of evidence, but probably not for 'works' in the sense the GP meant. https://en.wikipedia.org/wiki/Regression_toward_the_mean https://en.wikipedia.org/wiki/Regression_toward_the_mean https://en.wikipedia.org/wiki/Placebo https://en.wikipedia.org/wiki/Placebo