Beyond Matérn: On A Class of Interpretable Confluent Hypergeometric Covariance Functions
Beyond Matérn: On A Class of Interpretable Confluent Hypergeometric Covariance Functions
复制标题
超越马特恩:关于一类可解释的汇合超几何协方差函数
DOI:
10.1080/01621459.2022.2027775
复制
发表时间:
2022
影响因子:
3.7
通讯作者:
Bhadra, Anindya
中科院分区:
文献类型:
--
作者:
Ma, Pulong;Bhadra, Anindya
The Matérn covariance function is a popular choice for prediction in spatial statistics and uncertainty quantification literature. A key benefit of the Matérn class is that it is possible to get precise control over the degree of mean-square differentiability of the random process. However, the Matérn class possesses exponentially decaying tails, and thus, may not be suitable for modeling polynomially decaying dependence. This problem can be remedied using polynomial covariances; however, one loses control over the degree of mean-square differentiability of corresponding processes, in that random processes with existing polynomial covariances are either infinitely mean-square differentiable or nowhere mean-square differentiable at all. We construct a new family of covariance functions called theConfluent Hypergeometric(CH) class using a scale mixture representation of the Matérn class where one obtains the benefits of both Matérn and polynomial covariances. The resultant covariance contains two parameters: one controls the degree of mean-square differentiability near the origin and the other controls the tail heaviness, independently of each other. Using a spectral representation, we derive theoretical properties of this new covariance including equivalent measures and asymptotic behavior of the maximum likelihood estimators under infill asymptotics. The improved theoretical properties of the CH class are verified via extensive simulations. Application using NASA’s Orbiting Carbon Observatory-2 satellite data confirms the advantage of the CH class over the Matérn class, especially in extrapolative settings. Supplementary materials for this article are available online.
登录
查看更多内容
影响因子:
4.5
作者:
Gu, Mengyang;Wang, Xiaojing;Berger, James O.
通讯作者:
Berger, James O.
DOI:
--
发表时间:
1993
期刊:
影响因子:
--
作者:
M. Stein
通讯作者:
M. Stein
影响因子:
1.1
作者:
M. Bevilacqua;Tarik Faouzi
通讯作者:
Tarik Faouzi
影响因子:
1.7
作者:
P. Ma;B. Konomi;E. Kang
通讯作者:
E. Kang
DOI:
10.1137/19m1289893
发表时间:
2019
期刊:
SIAM/ASA J. Uncertain. Quantification
影响因子:
--
作者:
P. Ma
通讯作者:
P. Ma