Why HighOrder Polynomials Should Not be Used in Regression Discontinuity Designs Andrew Gelman Guido Imbens Aug Abstract It is common in regression discontinuity analysis to control for high order
We argue that estimators for causal e64256ects based on such methods can be misleading and we recommend researchers do not use them and instead use estimators based on local linear or quadratic polynomials or other smooth functions Keywords identi64
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