URL details: www.johnmyleswhite.com/notebook/2017/04/06/covariate-based-diagnostics-for-randomized-experiments-are-often-misleading/
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Covariate-Based Diagnostics for Randomized Experiments are Often Misleading · John Myles White
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Over the last couple of years, I’ve seen a large number of people attempt to diagnose the quality of their randomized experiments by looking for imbalances in covariates, because they expect covariate imbalances to be ruled out by successful randomization. But imbalance is, in general, not guaranteed for any specific random assignment – and, as such, many attempts to check for covariate imbalance are misleading. In this post, I’m going to use the Neyman-Rubin Causal Model to describe an ex
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