2022-01-26T02:37:53Zhttps://grips.repo.nii.ac.jp/?action=repository_oaipmhoai:grips.repo.nii.ac.jp:000011202021-07-06T01:24:01Z00001:00023Optimal Bandwidth Selection for Differences of Nonparametric Estimators with an Application to the Sharp Regression Discontinuity DesignengBandwidth selectionkernel density estimationlocal linear regressionregression discontinuity designhttp://id.nii.ac.jp/1295/00001120/info:doi/10.24545/00001120Technical ReportARAI, YoichiICHIMURA, Hidehiko政策研究大学院大学 / National Graduate Institute for Policy Studies 東京大学 / Department of Economics, The University of Tokyo経済学 / EconomicsWe consider the problem of choosing two bandwidths simultaneously for estimating the difference of two functions at given points. When the asymptotic approximation of the mean squared error (AMSE) criterion is used, we show that minimization problem is not well-defined when the sign of the product of the second derivatives of the underlying functions at the estimated points is positive. To address this problem, we theoretically define and construct estimators of the asymptotically first-order optimal (AFO) bandwidths which are well-defined regardless of the sign. They are based on objective functions which incorporate a second-order bias term. Our approach is general enough to cover estimation problems related to densities and regression functions at interior and boundary points. We provide a detailed treatment of the sharp regression discontinuity design.GRIPS Discussion Papers13-092013-06GRIPS Policy Research Center