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arXiv 1809.00737stat.ME
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曲线时间序列维数的小波估计

Wavelet estimation of the dimensionality of curve time series

Rodney V. Fonseca, Aluísio Pinheiro

摘要:

函数式数据分析在科学和工程的大多数领域中无处不在。提出了几种范式来处理这种类型的数据所固有的维数问题。稀疏、惩罚、阈值等原则已被用于解决这一问题。我们在这里讨论的解决方案的基础上,有限维函数空间。我们采用小波表示的泛函来估计这个有限的维度,并成功地模拟了一个时间序列的曲线。所提出的方法具有良好的渐近性质。此外,小波表示允许使用几个引导程序,它导致更快的计算算法。除了理论和计算性能,一些模拟研究和应用程序的真实数据。

英文摘要:

Functional data analysis is ubiquitous in most areas of sciences and engineering. Several paradigms are proposed to deal with the dimensionality problem which is inherent to this type of data. Sparseness, penalization, thresholding, among other principles, have been used to tackle this issue. We discuss here a solution based on a finite-dimensional functional space. We employ wavelet representation of the functionals to estimate this finite dimension, and successfully model a time series of curves. The proposed method is shown to have nice asymptotic properties. Moreover, the wavelet representation permits the use of several bootstrap procedures, and it results in faster computing algorithms. Besides the theoretical and computational properties, some simulation studies and an application to real data are provided.

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