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437RE: AI-GEOSTATS: Declustering

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  • Alessandro Gimona
    Nov 16, 2001
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      Isobel wrote:

      .....The semi-variogram and kriging techniques are not affected by
      clustering.
      > In fact, one of the main reasons for inventing kriging
      > was to make full use of every one of clustered and/or
      > preferentially sited sampling.
      >
      >
      I am slightly confused:
      ... if sampling is clustered preferentially in e.g. higher values
      areas, would this not bias the semi-variogram for the first few lags?...at
      least if, as it can happen, the variance is related to the mean.
      What about the effects of the possible over-estimation of the global
      mean due to clustering?

      thanks

      Alessandro Gimona

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