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GEOSTATS: Re: Costello's question

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  • Edzer Pebesma FGB
    ... This involves distributional assumptions (e.g. normality) in the log space (the mean and median should coincide there for this to hold). Without these
    Message 1 of 1 , Jun 30, 1997
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      On Mon, 30 Jun 1997 Syed.R.Syed@... wrote:

      > Simply exponentiating a kriged value obtained in log space without
      > theoretical correction introduces a bias.
      ... if you're after the expected value, yes.

      > That expectation in log
      > space (your kriging) becomes the median in normal space.

      This involves distributional assumptions (e.g. normality) in the log space
      (the mean and median should coincide there for this to hold). Without
      these assumptions, the back-transform maps to the geometric mean on
      the original scale (for instance, suppose there was a 0 on the original
      scale).
      --
      Edzer
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