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1088Re: AI-GEOSTATS: Declustering

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  • Pierre Goovaerts
    Jul 5, 2003
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      Hi Oliver,

      I don't know which algorithm you are using to compute these declustering
      weights but there is something wrong in your rescaling procedure.
      These declustering weights are proportional to the size of the polygon
      of influence of each observation and they can not be negative.

      Regards,

      Pierre Goovaerts

      <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>

      Dr. Pierre Goovaerts
      President of PGeostat, LLC
      Chief Scientist with Biomedware Inc.
      710 Ridgemont Lane
      Ann Arbor, Michigan, 48103-1535, U.S.A.

      E-mail: goovaert@...
      Phone: (734) 668-9900
      Fax: (734) 668-7788
      http://alumni.engin.umich.edu/~goovaert/

      <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>

      On Sat, 5 Jul 2003 oliver.sonnentag@... wrote:

      > hello list,
      > to get the global mean of my data set (484 observation wells) and
      > as a prerequisite for Normal Score Transformation with GSLIB, i
      > declustered my data with polygonal declustering. When
      > standardizing the weights to 1, so that the weights sum up to the
      > number of data, I receive some negative weights. this results in
      > negative values for the observations (nitrate concentration). how do
      > i have to interpret this ? does this require a special treatment? skip
      > them? as I mentioned before, i want to normal score transform the
      > data set prior to simple kriging.
      > many many thanx for some help in advance.
      > Regards,
      > Oliver
      >
      >
      >
      >
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