Modeling nonstationarity in space and time

Lyndsay Shand, Bo Li

Research output: Contribution to journalArticle

Abstract

We propose to model a spatio-temporal random field that has nonstationary covariance structure in both space and time domains by applying the concept of the dimension expansion method in Bornn et al. (2012). Simulations are conducted for both separable and nonseparable space-time covariance models, and the model is also illustrated with a streamflow dataset. Both simulation and data analyses show that modeling nonstationarity in both space and time can improve the predictive performance over stationary covariance models or models that are nonstationary in space but stationary in time.

Original languageEnglish (US)
Pages (from-to)759-768
Number of pages10
JournalBiometrics
Volume73
Issue number3
DOIs
StatePublished - Sep 2017

Keywords

  • Dimension expansion
  • Nonstationarity
  • Space-time random field

ASJC Scopus subject areas

  • Statistics and Probability
  • Biochemistry, Genetics and Molecular Biology(all)
  • Immunology and Microbiology(all)
  • Agricultural and Biological Sciences(all)
  • Applied Mathematics

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