Hierarchical sparse Cholesky decomposition with applications to high-dimensional spatio-temporal filtering
Hierarchical sparse Cholesky decomposition with applications to high-dimensional spatio-temporal filtering
复制标题
分层稀疏 Cholesky 分解及其在高维时空滤波中的应用
DOI:
10.1007/s11222-021-10077-9
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发表时间:
2022
影响因子:
2.2
通讯作者:
Katzfuss, Matthias
中科院分区:
文献类型:
--
作者:
Jurek, Marcin;Katzfuss, Matthias
Spatial statistics often involves Cholesky decomposition of covariance matrices. To ensure scalability to high dimensions, several recent approximations have assumed a sparse Cholesky factor of the precision matrix. We propose a hierarchical Vecchia approximation, whose conditional-independence assumptions imply sparsity in the Cholesky factors of both the precision and the covariance matrix. This remarkable property is crucial for applications to high-dimensional spatiotemporal filtering. We present a fast and simple algorithm to compute our hierarchical Vecchia approximation, and we provide extensions to nonlinear data assimilation with non-Gaussian data based on the Laplace approximation. In several numerical comparisons, including a filtering analysis of satellite data, our methods strongly outperformed alternative approaches.
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影响因子:
2.4
作者:
Jurek, Marcin;Katzfuss, Matthias
通讯作者:
Katzfuss, Matthias
影响因子:
3.8
作者:
G. Jóhannesson;N. Cressie;Hsin
通讯作者:
Hsin
DOI:
--
发表时间:
2012
期刊:
影响因子:
--
作者:
Fabio Sigrist;H. Künsch;W. Stahel
通讯作者:
W. Stahel
DOI:
--
发表时间:
2008
期刊:
--
影响因子:
--
作者:
A. Doucet;A. M. Johansen
通讯作者:
A. Doucet;A. M. Johansen
影响因子:
1.4
作者:
M. Katzfuss;Wenlong Gong
通讯作者:
M. Katzfuss;Wenlong Gong