Inference of Local Regression in the Presence of Nuisance Parameters

We consider inference based on local estimating equations in the presence of nuisance parameters. The framework is useful for a number of applications including those in economic policy evaluation based on discontinuities or kinks and in real-time financial risk management. We focus on the criterion-function-based (in particular, empirical likelihood-based) inference, and establish conditions under which the test statistic has a pivotal asymptotic distribution. In the key step of eliminating nuisance parameters in the (possibly non-smooth) criterion function, we consider approaches based on concentration and Laplace-type plug-in estimation. The former is natural, and the latter does not require optimization and can be computationally attractive in applications using simulations. Our framework can easily incorporate bias correction induced by localization, and the inference is robust to the identification strength of the parameter of interest. The high-level assumptions are illustrated with several examples. We also provide an empirical application which assesses heterogeneous effects of academic probation in college and gender differences under the quantile regression discontinuity design