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Ferien's avatar

Emil, is it good to assume regression coefficient is 0.5? The wiki article says Galton estimated coefficient as 2/3 for height, what is it now? Could it be that in Galton times coefficient was higher because environmental factor was more important than it is now?

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Arctotherium's avatar

Another plausible explanation for the overperformance of African immigrants relative to African Americans: severe dysgenic fertility among African Americans. It's not clear how long AA fertility has been dysgenic, but given the extremely un-Malthusian nature of the colonial era US, it's possible that it's been hundreds of years of selection for lower IQ, severely accelerated by the 1960s Great Society programs and consequent disintegration of the black community. Since a large chunk of African American ancestry is Igbo or Yoruba, both of whom have comparatively successful modern diasporas, I don't think the Igbo or Yoruba being smarter then the average SSAfrican is enough to account for their diaspora's higher performance compared to African Americans. I also don't think selective immigration can explain the whole gap: there aren't enough +3.5SD Nigerians to account for the widespread success of their diaspora, and presumably not every single highly capable Nigerian emigrates (and some more typical Nigerians also emigrate).

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