Testing Stability of Regression Discontinuity Models
Giovanni Cerulli (),
Arthur Lewbel () and
A chapter in Regression Discontinuity Designs, 2017, vol. 38, pp 317-339 from Emerald Publishing Ltd
Abstract Regression discontinuity (RD) models are commonly used to nonparametrically identify and estimate a local average treatment effect. Dong and Lewbel (2015) show how a derivative of this effect, called treatment effect derivative (TED) can be estimated. We argue here that TED should be employed in most RD applications, as a way to assess the stability and hence external validity of RD estimates. Closely related to TED, we define the complier probability derivative (CPD). Just as TED measures stability of the treatment effect, the CPD measures stability of the complier population in fuzzy designs. TED and CPD are numerically trivial to estimate. We provide relevant Stata code, and apply it to some real datasets.
Keywords: Regression discontinuity; external validity; threshold changes; marginal effects; treatment effect heterogeneity; program evaluation; C21; C25 (search for similar items in EconPapers)
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