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RE: GEOSTATS: Data Transformations

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  • keith r. blair
    William: What do the variograms look like for the untransformed data? Try some relative-pair variograms or correlograms on the raw data... perhaps a log
    Message 1 of 2 , Apr 17, 1998
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      William:

      What do the variograms look like for the untransformed data? Try some
      relative-pair variograms or correlograms on the raw data... perhaps a log
      transform is not required.

      keith

      ----------
      > De: William C. Thayer <wcthaye@ibm>
      > A: ai-geostats@...
      > Asunto: GEOSTATS: Data Transformations
      > Fecha: Thursday, April 16, 1998 4:18 PM
      >
      > Hello. I have data on lead contaminated sites that appears to be
      > log-normally distributed. My question is: what factors should I
      > consider prior to (and during and after!) transforming the data to "log
      > space" for the purposes of variogram modeling. My primary objectives
      > are to calculate a global mean and estimation error for each site
      > although I will also attempt to calculate block means and estimation
      > errors.
      > Feel free to suggest references.
      > I will summarize replies.
      >
      > Thank you,
      > Bill Thayer
      > SUNY College of Environmental Science and Forestry
      >
      >
      >
      >
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