Don’t tell me I’m short; it’s a microaggression.
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Here's an example I thought of: North & South Koreans vary in height because of nutritional access. Imagine the border collapses suddenly and there's more migration between the countries. Now there might be more S Koreans in N Korea. The average height of the population rises and
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is correlated with lots of genes that S Koreans differ in, which have nothing to do with height. If those other population differences aren't corrected for, it looks like height is being selected for when really there's just a compositional effect of who lives in N Korea now.
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