On unbiased backtransform of lognormal kriging estimates |
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Authors: | Jorge Kazuo Yamamoto |
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Institution: | 1.Department of Environmental and Sedimentary Geology, Institute of Geosciences,University of S?o Paulo,S?o Paulo,Brazil |
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Abstract: | Lognormal kriging is an estimation technique that was devised for handling highly skewed data distributions. This technique
takes advantage of a logarithmic transformation that reduces the data variance. However, backtransformed lognormal kriging
estimates are biased because the nonbias term is totally dependent on a semivariogram model. This paper proposes a new approach
for backtransforming lognormal kriging estimates that not only presents none of the problems reported in the literature but
also reproduces the sample histogram and, consequently, the sample mean. |
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Keywords: | Backtransform Lognormal kriging Uncertainty Interpolation variance Smoothing effect |
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