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.
|Original language||English (US)|
|Number of pages||11|
|Journal||Journal of the International Association for Mathematical Geology|
|State||Published - Apr 1 1980|
- robust estimation