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Douglas_Knight comments on Open thread, August 4 - 10, 2014 - Less Wrong Discussion
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There are serious restriction of range problems with the literature. I believe that there is one small French adoption study with unrestricted range which produced 1 sigma IQ difference between the bottom and top buckets (deciles?) of adopting families.
I wonder if this what Shalizi alludes to when he says that IQ is closer to that of the adoptive parents than that of the biological parents.
(Both references describe the same study.) Capron & Duyme found 38 French children placed for adoption before age 2, 20 of them to parents with very high socioeconomic status (operationalized as having 14-23 years of education and working a profession) and 18 to parents with very low socioeconomic status (unskilled & semi-skilled labourers or farmers, with 5-8 years of education). When the kids took the WISC-R IQ test, those adopted into the high-SES families had a mean IQ of 111.6, while those in the low-SES families had a mean IQ of 100.0, for a difference of 0.77 sigma.
Thanks!