Why High-order Polynomials Should not be Used in Regression Discontinuity Designs
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It is common in regression discontinuity analysis to control for high order (third, fourth, or higher) polynomials of the forcing variable. We argue that estimators for causal effects based on such methods can be misleading, and we recommend researchers do not use them, and instead use estimators
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美国国家经济研究局创建时间：
2014-08-01
