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Hierarchical spatio-temporal change-point detection
Umeå University, Faculty of Science and Technology, Department of Mathematics and Mathematical Statistics.
Department of Mathematical Sciences, Chalmers University of Technology & University of Gothenburg, Gothenburg, Sweden.
Department of Statistics, Computer Science, and Mathematics, Public University of Navarre, Pamplona, Spain.
Department of Mathematics, University Jaume I, Castellón, Spain.
2023 (English)In: American Statistician, ISSN 0003-1305, E-ISSN 1537-2731, Vol. 77, no 4, p. 390-400Article in journal (Refereed) Published
Abstract [en]

Detecting change-points in multivariate settings is usually carried out by analyzing all marginals either independently, via univariate methods, or jointly, through multivariate approaches. The former discards any inherent dependencies between different marginals and the latter may suffer from domination/masking among different change-points of distinct marginals. As a remedy, we propose an approach which groups marginals with similar temporal behaviors, and then performs group-wise multivariate change-point detection. Our approach groups marginals based on hierarchical clustering using distances which adjust for inherent dependencies. Through a simulation study we show that our approach, by preventing domination/masking, significantly enhances the general performance of the employed multivariate change-point detection method. Finally, we apply our approach to two datasets: (i) Land Surface Temperature in Spain, during the years 2000–2021, and (ii) The WikiLeaks Afghan War Diary data.

Place, publisher, year, edition, pages
Taylor & Francis, 2023. Vol. 77, no 4, p. 390-400
Keywords [en]
Clustering, Functional data, Land surface temperature, Multivariate analysis, Point patterns, Satellite images, Trace-variogram
National Category
Probability Theory and Statistics
Identifiers
URN: urn:nbn:se:umu:diva-206941DOI: 10.1080/00031305.2023.2191670ISI: 000969294600001Scopus ID: 2-s2.0-85152437334OAI: oai:DiVA.org:umu-206941DiVA, id: diva2:1753538
Available from: 2023-04-27 Created: 2023-04-27 Last updated: 2024-01-12Bibliographically approved

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Moradi, Mehdi

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