Variation of treatment effect problematic. No easy solution yet. CT @StatModeling http://andrewgelman.com/2015/05/04/a-causal-inference-version-of-a-statistics-problem-if-you-fit-a-regression-model-with-interactions-and-the-underlying-process-has-an-interaction-your-coefficients-wont-be-directly-interpretable/ …
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