There's little difference between siblings: http://www.sciencedirect.com/science/article/pii/S0160289606001115 …
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I know. :) Hard to get around that. Lots of conflicting data on this question.
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should be a lot of work if i understand the research design here correctly
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Not all. Download the studies table from existing meta-analysis (Lynn's), compare d to SE calculated from SE.
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How do you get around the problem of poor sampling of really low IQ men?
@sanderwagner
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Lynn's meta-analysis is wacky: almost all the studies are >20yo or from developing countries.
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