On identifiability and consistency of the nugget in Gaussian spatial process models
On identifiability and consistency of the nugget in Gaussian spatial process models
复制标题
高斯空间过程模型中块金的可识别性和一致性
DOI:
10.1111/rssb.12472
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Banerjee, Sudipto
中科院分区:
文献类型:
--
作者:
Tang, Wenpin;Zhang, Lu;Banerjee, Sudipto
Spatial process models popular in geostatistics often represent the observed data as the sum of a smooth underlying process and white noise. The variation in the white noise is attributed to measurement error, or microscale variability, and is called the ‘nugget’. We formally establish results on the identifiability and consistency of the nugget in spatial models based upon the Gaussian process within the framework of in-fill asymptotics, that is the sample size increases within a sampling domain that is bounded. Our work extends results in fixed domain asymptotics for spatial models without the nugget. More specifically, we establish the identifiability of parameters in the Matérn covariogram and the consistency of their maximum likelihood estimators in the presence of discontinuities due to the nugget. We also present simulation studies to demonstrate the role of the identifiable quantities in spatial interpolation.
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DOI:
10.1007/978-3-642-17086-7
发表时间:
2012
期刊:
--
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