taw comments on Review: Selfish Reasons to Have More Kids - Less Wrong
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As I understand it, it means that they did a regression between some aggregate measure of family environment (like total family income) and the outcome of interest and it put a small regression coefficient on the aggregate measure and/or that the differences in outcomes between adopted children in the same home were not smaller than the differences between adopted children in different comes. In the later case, I think you can compare adopted children both to adopted and unadopted siblings. Have I explained that clearly?
Here's an arbitrary adoption paper cited in the book: Sacerdote, B. (January 01, 2007). How Large Are the Effects from Changes in Family Environment? A Study of Korean American Adoptees *. Quarterly Journal of Economics, 122, 1, 119-157.
Note that the Sacerdote is the only study I've been able to find on adult outcomes of adoptees. There's not much out there.
I want to say "That can't be right", but I don't have Caplan's book with me to check his references. I'll check this evening.
That study pretty much changed my mind about adopting, so if you find anything else, I'd like to know.