Variograms: Taboos, Conjectures and Facts

Relatore
Dr. Emilio Porcu - Università Jaune I of Castellòn.

Data e ora
mercoledì 11 febbraio 2009 alle ore 16.15 - 16.15 caffè e pasticcini, inizio seminario ore 16.30

Luogo
Ca' Vignal 3 - Piramide, Piano 0, Sala Verde

Referente
Laura Maria Morato

Referente esterno

Data pubblicazione
20 gennaio 2009

Dipartimento
 

Riassunto

 

 

 

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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