Robust estimation of the variogram: I |
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| Authors: | Noel Cressie and Douglas M Hawkins |
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| Institution: | (1) School of Mathematical Sciences, The Flinders University of South Australia, Australia;(2) National Research Institute for Mathematical Sciences, CSIR, P.O. Box 395, 0001 Pretoria, South Africa |
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| 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.Visiting Scientist, NRIMS, during the period in which this work was carried out. |
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| Keywords: | Geostatistics kriging robust estimation variogram |
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