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They don't need to be, at sample sizes in the 100,000s. Most of these studies are not even using IQ tests but "years of education" which is a measure of IQ with a laughably large standard error - but with very large sample sizes very precise estimates can be made of the effect of a particular SNA on the affected people's intelligence.

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Using "years of education" as a measure seems like it might just end up measuring how well you can use genes to identify whether someone's of the right socioeconomic class to get their children into university. I can't really see any way around this.

Well I believe they control for social status. And also a lot of other things, see gwern's comment above. In any case, I don't expect there to be genes that predict social class. And if there were, that would be super interesting in itself.

>I don't expect there to be genes that predict social class

Genes for skin pigment

>super interesting

If you've never heard of inequality before, I guess

But they control for race, and picked results that generalize across different populations.

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