New post: Evidence on the impact of sustained use of polynomial regression on causal inference: a claim that coal he http://andrewgelman.com/2013/08/05/evidence-on-the-impact-of-sustained-use-of-polynomial-regression-on-causal-inference-a-claim-that-coal-heating-is-reducing-lifespan-by-5-years-for-half-a-billion-people/ …
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