Variograms: Taboos, Conjectures and Facts

Dr. Emilio Porcu - Università Jaune I of Castellòn.
Date and time
Wednesday, February 11, 2009 at 4:15 PM - 16.15 caffè e pasticcini, inizio seminario ore 16.30
Ca' Vignal - Piramide, Floor 0, Hall Verde
Programme Director
Laura Maria Morato
External reference
Publication date
January 20, 2009





In this seminar we show results that may be of interest for the mathematic and spatial statistics community as well.
We show that a large subclass of variograms is closed under Schur products and that some desirable stability properties,
like the Schur product of ad hoc compositions, can be obtained under the proposed setting. We
introduce new classes of kernels of Schoenberg-L´evy type and show some important
properties of eventually constant, radially symmetric variograms. In particular,
we characterize eventually constant variograms in terms of their permissibility in
Euclidean spaces of arbitrary high dimension. All the results are discussed in the
light of implications for spatial statisticians.


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