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[ai-geostats] Sill Not Reaching 1.0

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  • Edward Isaaks
    Hi Collin It is likely that your variogram or correlogram does not reach the sill because your data are spatially correlated. It is well known that
    Message 1 of 1 , Feb 8 12:51 PM
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      Hi Collin

      It is likely that your variogram or correlogram does not reach the sill
      because your data are spatially correlated. It is well known that
      Gamma_bar(D,D) <= Sill. (The average value of the variogram over the deposit
      is less than or equal to the sill).

      As for the correlogram -- it is not an artifact as some would have you
      believe. In fact, the correlogram can be seen as a measure of spatial
      correlation following the removal of first and second order trends from the
      data. For an explanation of this last statement, type
      www.isaaks.com/Info/ in your browser and see the file "variofaqs.pdf".

      Hope this helps.
      Edward Isaaks
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