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AI-GEOSTATS: Nugget to Sill Ratio

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  • Isobel Clark
    Jul The nugget effect is the (semi) variance between two samples which might be taken at almost exactly the same spot. Or, expressed otherwise, the variance of
    Message 1 of 2 , Oct 30, 2003
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      Jul

      The nugget effect is the (semi) variance between two
      samples which might be taken at almost exactly the
      same spot. Or, expressed otherwise, the variance of
      replicated samples.

      The total sill is the variance of values within your
      data set (or, more strictly, within all possible
      samples).

      Thus the nugget to not-nugget ratio is the proportion
      of the variation you can expect to predict with a
      spatial model, whilst the nugget part is that
      variation you cannot predict no matter how closely you
      sample.

      Isobel
      http://geoecosse.bizland.com/books.htm



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