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On the consistency of cross-validation in kernel nonparametric regression. (English) Zbl 0539.62046
Summary: For the nonparametric regression model $$Y(t_ i)=\theta(t_ i)+\epsilon(t_ i)$$ where $$\theta$$ is a smooth function to be estimated, $$t_ i's$$ are nonrandom, $$\epsilon(t_ i)'s$$ are i.i.d. errors, this paper studies the behavior of the kernel regression estimate ${\hat \theta}(t)=[\sum^{n}_{j=1}K(\lambda^{-1}(t_ j-t))Y(t_ j)]/[\sum^{n}_{j=1}K(\lambda^{-1}(t_ j-t))]$ when $$\lambda$$ is chosen by cross-validation on the average squared error. Strong consistency in terms of the average squared error is established for uniform spacing, compact kernel and finite fourth error moment.

##### MSC:
 62G05 Nonparametric estimation 62J02 General nonlinear regression 62J05 Linear regression; mixed models
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