Robust estimation of the variogram: I

  • Cressie N
  • Hawkins D
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Abstract

Abstract  It is a matter of common experience that ore values often do not follow the normal (or lognormal) distributions assumed for them, but, instead, follow some other heavier-tailed distribution. In this paper we discuss the robust estimation of the variogram when the distribution is normal-like in the central region but heavier than normal in the tails. It is shown that the use of a fourth-root transformation with or without the use of M-estimation yields stable robust estimates of the variogram.

Author-supplied keywords

  • Geostatistics
  • kriging
  • robust estimation
  • variogram

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Authors

  • Noel Cressie

  • Douglas M. Hawkins

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