Eh, I see a slight difference between psychology and economics/sociology. The difference? Patients can speak for themselves on the efficacy of the treatment.
Sure, there's things like selection bias and placebos, etc etc, but that happens with regular medicine as well.
If psychologists do X procedure, and it works 75% of the time, as opposed to Y procedure which works 30% of the time, then go with procedure X based off scientific research.
With economics and sociology, you can spin the data any which way you want... it's not like money and dead people can speak for themselves.

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