It's very stark in the data how many white parents take their kids out of the SF K-12 system http://priceonomics.com/where-are-all-the-white-people-in-san-francisco/ …https://twitter.com/NYTmag/status/740945088201826304 …
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that would be interesting to crosstab school enrollment and school age pop. Don't know if it's been done
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