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arXiv 1606.06993stat.ME
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核分布函数估计量的精确均方误差和带宽选择

Exact mean integrated squared error and bandwidth selection for kernel distribution function estimators

Vitaliy Oryshchenko

摘要:

对于任意阶高斯核函数,导出了正态混合累积分布函数核估计的均方误差(MISE)的一个精确的、封闭的、易于计算的表达式.比较了经验分布函数的MISE、核估计的不可行最小MISE和渐近最优二阶一致核。结果提供了直接的扩展到其他类的核函数和分布。分析还提供了一个指导时,使用高阶内核的分布函数估计。基于正态混合对未知分布的非渐近逼近,提出了一种同时选择最优带宽和核阶数的简单插入式方法。仿真研究表明,该方法在有限的样本,从而提供了一个可行的替代现有的带宽选择程序。

英文摘要:

An exact, closed form, and easy to compute expression for the mean integrated squared error (MISE) of a kernel estimator of a normal mixture cumulative distribution function is derived for the class of arbitrary order Gaussian-based kernels. Comparisons are made with MISE of the empirical distribution function, the infeasible minimum MISE of kernel estimators, and the asymptotically optimal second order uniform kernel. The results afford straightforward extensions to other classes of kernel functions and distributions. The analysis also offers a guide on when to use higher order kernels in distribution function estimation. A simple plug-in method of simultaneously selecting the optimal bandwidth and kernel order is proposed based on a non-asymptotic approximation of the unknown distribution by a normal mixture. A simulation study shows that the method works well in finite samples, thus providing a viable alternative to existing bandwidth selection procedures.

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