One glaring bias built into Richwine’s study is that the IQ test he used is top coded for an educational level of 12 years, but he deliberately doesn’t account for actual education or class level of the test takers or the average education and class level of the subgroups. The fact that our undergound labor market disproportionately draws in uneducated and unskilled workers from nations with geographical proximity to us is used to characterize immigrants from such countries in general.

This is one hell of an assumption to make about immigrants in general, especially when the IQ difference he’s pointing to as justifying his policy proposals is less than one half of one standard deviation.

This study is pure shit. I’ve seen statistical studies with far more supporting data via the population sizes being studied and much better methodology where in the conclusion the originating hypothesis was determined equivocal at best. Honest researchers go in with maybe a hunch, but they don’t set out to, by hook or by crook, prove their own ideological biases.