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Vaniver comments on Reversed Stupidity Is Not Intelligence - Less Wrong
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This article has a lot of bell-curve verbal IQ graphs from GSS (General Social Survey) data for the years 2000-2012, using the wordsum score as a measure of intelligence:
http://blogs.discovermagazine.com/gnxp/2012/04/verbal-intelligence-by-demographic/
It shows Republicans as smarter than Democrats, but Liberals smarter than Conservatives, and White people smarter than Black people, and some other comparisons.
Kind of; the great thing about those distributions is that you can talk about more of the distribution than one summary statistic. There's a clump of high IQ democrats, a clump of low IQ democrats, and then a clump of medium IQ democrats, whereas the Republicans look like one clump of medium IQ republicans. There are more Democrats from 0 to 5, more Republicans from about 6 to 8, and a tiny few more Democrats from 9 to 10.
This matches with the prediction that there is a significant group of low-vocabulary people who vote predominantly Democratic, the middles voting somewhat more Republican, and the highs about evenly split.