This is a very good article on messed up way we talk about education in the US nytimes.com/2014/06/29/ups
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Simpson's Paradox. Learn it. Apply it. Regurgitate it.
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Because you are judging the system by performance of the students. Break down by ethnicity and compare cross-section.
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Orthogonal. Article is about invalid K-12/higher ed comparison due to different quality criteria (avg vs share of top perc)
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Err how is it Orthogonal if averages are being compared across countries?
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Here's a huge chart headline the NYT uses - "American College Graduates, Trailing in Math Skills." Still orthogonal?
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Still don't see a specific clear instance of Simpson's paradox in there.

