Variogram models must be positive-definite |
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| Authors: | Margaret Armstrong and Romain Jabin |
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| Institution: | (1) Centre de Geostatistique et de Morphologie Mathematique, Ecole des Mines, 35 Rue St. Honore, 77305 Fontainbleau, France |
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| Abstract: | The aim of this short article is to stress the importance of using only positive-definite functions as models for covariance functions and variograms.The two examples presented show that a negative variance can easily be obtained when a nonadmissible function is chosen for the variogram model. |
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| Keywords: | Variograms geostatistics positive-definite |
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