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gwern comments on Why Are Individual IQ Differences OK? - Less Wrong
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I finally got a chance to give that a look, skimmed various areas to get an idea of what's in there. What I reallly want is a chart that looks like this:
Poverty
War
Sweatshop
Schooling
Racial Attitude
Where all the boxes for intersections have the average IQ score, and there are, of course, more columns to account for all the things that might have an effect. Lead paint exposure, crack epidemics, etc.
Without that, we're never going to have even the slightest clue. Even with it, we have to ask "Which was the chicken and which was the egg".
I have no idea what your chart would mean. The book supplies tons of regressions if you want some sort of prediction on an individual level (and cites many individual studies which may be more useful than cross-national regressions), so you can't complain data is lacking.