Publication details

Maximum likelihood method for bandwidth selection in kernel conditional density estimate



Year of publication 2019
Type Article in Periodical
Magazine / Source Computational Statistics
MU Faculty or unit

Faculty of Science

Web Full Text
Keywords kernel smoothing; conditional density; methods for bandwidth selection; leave-one-out maximum likelihood method
Description This paper discusses the kernel estimator of conditional density. A significant problem of kernel smoothing is bandwidth selection. The problem consists in the fact that optimal bandwidth depends on the unknown conditional and marginal density. This is the reason why some data-driven method needs to be applied. In this paper, we suggest a method for bandwidth selection based on a classical maximum likelihood approach. We consider a slight modification of the original method—the maximum likelihood method with one observation being left out. Applied to two types of conditional density estimators—to the Nadaraya–Watson and local linear estimator, the proposed method is compared with other known methods in a simulation study. Our aim is to compare the methods from different points of view, concentrating on the accuracy of the estimated bandwidths, on the final model quality measure, and on the computational time.
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