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arXiv 1306.0517stat.ME
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方向数据核密度估计带宽选择器的精确风险改进

Exact risk improvement of bandwidth selectors for kernel density estimation with directional data

Eduardo García-Portugués

摘要:

本文提出了一种新的基于方向数据的核密度估计带宽选择器。这些选择器是基于渐近和精确的误差表达式的核密度估计结合冯米塞斯分布的混合物。建议的选择器的性能进行了研究,在模拟研究中,并与其他现有的规则进行比较,为各种各样的方向性的情况下,样本量和尺寸。基于精确误差表达式的选择器在几乎所有情况下都具有所研究的选择器的最佳行为。这个选择器是用圆形和球形情况下的实际数据来说明的。

英文摘要:

New bandwidth selectors for kernel density estimation with directional data are presented in this work. These selectors are based on asymptotic and exact error expressions for the kernel density estimator combined with mixtures of von Mises distributions. The performance of the proposed selectors is investigated in a simulation study and compared with other existing rules for a large variety of directional scenarios, sample sizes and dimensions. The selector based on the exact error expression turns out to have the best behaviour of the studied selectors for almost all the situations. This selector is illustrated with real data for the circular and spherical cases.

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