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An effective bandwidth selector for local least squares regression. (English) Zbl 0868.62034
Summary: Local least squares kernel regression provides an appealing solution to the nonparametric regression, or “scatterplot smoothing”problem. The practical implementation of any scatterplot smoother is greatly enhanced by the availability of a reliable rule for automatic selection of the smoothing parameter. We apply the ideas of plug-in bandwidth selection to develop strategies for choosing the smoothing parameter of local linear least squares kernel estimators. Our results are applicable to odd-degree local polynomial fits and can be extended to other settings, such as derivative estimation and multiple nonparametric regression. An implementation in the important case of local linear fits with univariate predictors is shown to perform well in practice. A by-product of our work is the development of a class of nonparametric variance estimators, based on local least squares ideas, and plug-in rules for their implementation.

62G07Density estimation