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Variogram models must be positive-definite

  • Margaret Armstrong
  • Romain Jabin
Article

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.

Key words

Variograms geostatistics positive-definite 

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Copyright information

© Plenum Publishing Corporation 1981

Authors and Affiliations

  • Margaret Armstrong
    • 1
  • Romain Jabin
    • 1
  1. 1.Centre de Geostatistique et de Morphologie MathematiqueEcole des MinesFontainbleauFrance

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