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arXiv 2302.02247math.STstat.TH
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函数值空间过程的谱密度估计

Spectral Density Estimation of Function-Valued Spatial Processes

Rafail Kartsioukas, Stilian Stoev, Tailen Hsing

摘要:

谱密度函数描述了$\mathbb{R}^d$上平稳随机过程的二阶性质。本文考虑了取值于可分希尔伯特空间的连续时间随机过程的谱密度的非参数估计。我们的估计是基于核平滑,可以应用到各种各样的空间采样方案,包括那些在不规则的空间位置观察到的数据。因此,它在空间统计中找到了直接的应用,其中自然会出现不规则的采样数据。在一般条件下,在一个混合域渐近设置的估计的偏差和方差率。当在规则网格上观察数据时,估计量的最优速率匹配根据幂律衰减的一类协方差函数的最小最大速率。在一般的条件下,对高斯Hilbert空间值过程,建立了谱密度估计的渐近正态性。最后,鉴于对实际应用的渐近结果专门的情况下,离散采样的功能数据的再生核希尔伯特空间。

英文摘要:

The spectral density function describes the second-order properties of a stationary stochastic process on $\mathbb{R}^d$. This paper considers the nonparametric estimation of the spectral density of a continuous-time stochastic process taking values in a separable Hilbert space. Our estimator is based on kernel smoothing and can be applied to a wide variety of spatial sampling schemes including those in which data are observed at irregular spatial locations. Thus, it finds immediate applications in Spatial Statistics, where irregularly sampled data naturally arise. The rates for the bias and variance of the estimator are obtained under general conditions in a mixed-domain asymptotic setting. When the data are observed on a regular grid, the optimal rate of the estimator matches the minimax rate for the class of covariance functions that decay according to a power law. The asymptotic normality of the spectral density estimator is also established under general conditions for Gaussian Hilbert-space valued processes. Finally, with a view towards practical applications the asymptotic results are specialized to the case of discretely-sampled functional data in a reproducing kernel Hilbert space.

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