Nonstationary Modeling With Sparsity for Spatial Data via the Basis Graphical Lasso
Nonstationary Modeling With Sparsity for Spatial Data via the Basis Graphical Lasso
复制标题
通过基本图形套索对空间数据进行稀疏性非平稳建模
DOI:
10.1080/10618600.2020.1811103
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发表时间:
2021
影响因子:
2.4
通讯作者:
Becker, Stephen
中科院分区:
文献类型:
--
作者:
Krock, Mitchell;Kleiber, William;Becker, Stephen
Many modern spatial models express the stochastic variation component as a basis expansion with random coefficients. Low rank models, approximate spectral decompositions, multiresolution representations, stochastic partial differential equations, and empirical orthogonal functions all fall within this basic framework. Given a particular basis, stochastic dependence relies on flexible modeling of the coefficients. Under a Gaussianity assumption, we propose a graphical model family for the stochastic coefficients by parameterizing the precision matrix. Sparsity in the precision matrix is encouraged using a penalized likelihood framework—we term this approach the basis graphical lasso. Computations follow from a majorization-minimization (MM) approach, a byproduct of which is a connection to the standard graphical lasso. The result is a flexible nonstationary spatial model that is adaptable to very large datasets with multiple realizations. We apply the model to two large and heterogeneous spatial datasets in statistical climatology and recover physically sensible graphical structures. Moreover, the model performs competitively against the popular LatticeKrig model in predictive cross-validation but improves the Akaike information criterion score and a log score for the quality of the joint predictive distribution.
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影响因子:
2.7
作者:
Fuentes, M
通讯作者:
Fuentes, M
影响因子:
2.7
作者:
Bien, Jacob;Tibshirani, Robert J.
通讯作者:
Tibshirani, Robert J.
DOI:
--
发表时间:
2014
期刊:
影响因子:
--
作者:
S. Tajbakhsh;N. Aybat;E. Castillo
通讯作者:
E. Castillo
影响因子:
1.8
作者:
Friedman, Jerome;Hastie, Trevor;Tibshirani, Robert
通讯作者:
Tibshirani, Robert
影响因子:
3.9
作者:
Fattahi, Salar;Zhang, Richard;Sojoudi, Somayeh
通讯作者:
Sojoudi, Somayeh