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Your methodology should have taken self-selection into consideration.
In particular, we estimate the effect of herbicide-tolerant soybeans on herbicide use, crop yields, and farm profits using an econometric model that corrects for self-selection and simultaneity.
We offer self-selection as the likely culprit.
Although self-selection is difficult to examine, Surette found that returns are always higher when corrected for self-selection - indeed, more than twice as high for the Associate degree.
Evaluations of drug treatment programs have reached more positive conclusions but generally suffer from methodological problems, most notably self-selection into treatment.
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