arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1607.05042stat.ME
收藏

整体和局部功能深度的实证比较

An empirical comparison of global and local functional depths

Carlo Sguera, Rosa E. Lillo

摘要:

函数数据深度提供了一个中心向外排序标准,允许定义函数框架中的度量,如中位数、修剪均值、中心区域或等级。函数数据深度可以是全局的,也可以是局部的。对于全局深度,曲线$x$的中心度同等地取决于样本观测的其余部分,而对于局部深度,每个观测在定义$x$的中心度方面的贡献随着与$x$的距离的增加而减小。我们经验比较的全球和本地的方法,专注于三个全球和两个地方的功能深度的功能深度问题。首先,我们考虑两个真实的数据集,并表明全球和局部深度可能提供不同的见解。其次,我们使用模拟数据来显示,当我们应该期望的功能深度问题的全局和局部方法之间的差异。

英文摘要:

A functional data depth provides a center-outward ordering criterion which allows the definition of measures such as median, trimmed means, central regions or ranks in a functional framework. A functional data depth can be global or local. With global depths, the degree of centrality of a curve $x$ depends equally on the rest of the sample observations, while with local depths, the contribution of each observation in defining the degree of centrality of $x$ decreases as the distance from $x$ increases. We empirically compare the global and the local approaches to the functional depth problem focusing on three global and two local functional depths. First, we consider two real data sets and show that global and local depths may provide different insights. Second, we use simulated data to show when we should expect differences between a global and a local approach to the functional depth problem.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑