Performing an universal kriging on chemical data (log transform of concentration), in some estimation points I obtained an estimation variance larger (in some case three times) than the sill of residual variogram. From what I know this is related to negative weights in the kriging matrix (as I can see looking at the debug file). Now I'm wondering how (if it is possible) I can use this estimation variance.
Or better: in which way I can interpret this estimation variance?
Thank you in advance for your help...
Sebastiano Trevisani
Ph. D. student --Geology Departement --Padova University --Italy
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