Charles Murray posts and interesting graph in his blog http://blog.american.com/?p=4259 , which Andrew Gelman responds to in his blog http://www.stat.columbia.edu/~cook/movabletype/archives/2009/08/the_divergence.html#more
Gelman’s post and
These aren't standard categories that I've ever seen, so there's some sort of clustering going on. Was this clustering looking at "hey, was there any group of people who became more liberal since 1972?", and then post-describing them?
p.s. I like Gelman’s understatement: "Grad students ... they're not at the 95th percentile of income"
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