The way of telling if it works is: statistical significance.
This "approach" to research was debunked as pseudoscience long ago (eg here is one from 1967[1], and that wasn't the first)... So the answer is: no one knows what works or doesn't, (edit: at least not based on the usual claimed method of drawing conclusions from the data).
This "approach" to research was debunked as pseudoscience long ago (eg here is one from 1967[1], and that wasn't the first)... So the answer is: no one knows what works or doesn't, (edit: at least not based on the usual claimed method of drawing conclusions from the data).
[1] http://www.fisme.science.uu.nl/staff/christianb/downloads/me...