Partition-Based Nonstationary Covariance Estimation Using the Stochastic Score Approximation
Partition-Based Nonstationary Covariance Estimation Using the Stochastic Score Approximation
复制标题
使用随机分数近似的基于分区的非平稳协方差估计
DOI:
10.1080/10618600.2022.2044830
复制
发表时间:
2022
影响因子:
2.4
通讯作者:
Fuentes, Montserrat
中科院分区:
文献类型:
--
作者:
Muyskens, Amanda;Guinness, Joseph;Fuentes, Montserrat
We introduce computational methods that allow for effective estimation of a flexible nonstationary spatial model when the field size is too large to compute the multivariate normal likelihood directly. In this method, the field is defined as a weighted spatially varying linear combination of a globally stationary process and locally stationary processes. Often in such a model, the difficulty in its practical use is in the definition of the boundaries for the local processes, and therefore, we describe one such selection procedure that generally captures complex nonstationary relationships. We generalize the use of a stochastic approximation to the score equations in this nonstationary case and provide tools for evaluating the approximate score in O(n log n) operations andO(n) storage for data on a subset of a grid. We perform various simulations to explore the effectiveness and speed of the proposed methods and conclude by predicting average daily temperature. Supplementary materials for this article are available online.
登录
查看更多内容
影响因子:
1.7
作者:
Fuentes, M
通讯作者:
Fuentes, M
影响因子:
2.5
作者:
Matthew J. Heaton;W. F. Christensen;Maria A. Terres
通讯作者:
Matthew J. Heaton;W. F. Christensen;Maria A. Terres
影响因子:
3.1
作者:
Jie Chen;Lei Wang;M. Anitescu
通讯作者:
M. Anitescu
DOI:
--
发表时间:
2013
期刊:
影响因子:
--
作者:
J. Guinness;M. Stein
通讯作者:
M. Stein
DOI:
--
发表时间:
2013
期刊:
影响因子:
--
作者:
M. Stein;Jie Chen;M. Anitescu
通讯作者:
M. Anitescu