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Vaniver comments on Reversed Stupidity Is Not Intelligence - Less Wrong
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I'd expect the correlation between IQ and WORDSUM to be much weaker when controlling for educational attainment, so some of those graphs will have to be taken with a grain of salt.
What would this statement predict about the WORDSUM distributions by educational level? Is that what that graph shows? (If the graph doesn't have enough data to answer that question, how else could you answer it?)
So... I think the correlation between IQ and WORDSUM is mostly mediated by education (i.e., in terms of Stuff That Makes Stuff Happen, there's an arrow from IQ to education and one from education and WORDSUM -- there's also one directly from IQ to WORDSUM but it's thinner). So I'd expect that the third graph in that article to show an effect more extreme than if you used IQ instead.