![]() Just to explain some more: Sometimes people frame this as a problem of trying to figure out the correct specification for the running variable: should it be linear, or polynomial, or locally linear, whatever? But I don’t think this is the right way to think of things. People are taught this is what to do, it spits out publishable results, everybody’s happy. Nothing special here, just another day at the sausage factory. ![]() They also make the classic error of comparing the statistical significance of different comparisons. He reports that the graphs come from a study from the University of Pennsylvania trying to estimate the effect of a care management intervention for high risk patients. Ethan Steinberg sends in these delightful regression discontinuity graphs: ![]()
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