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In [[statistics]] and [[signal processing]], the method of '''empirical orthogonal function''' ('''EOF''') analysis is a decomposition of a [[signal processing|signal]] or data set in terms of [[orthogonal]] [[basis function]]s which are determined from the data. The term is also interchangeable with the geographically weighted [[Principal components analysis|PCAs]] in [[geophysics]].<ref name=eofa>{{cite web
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