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Re: [ai-geostats] gslib postik and cpdf

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  • Digby Millikan
    gianni, what about subtracting 1 from your values, so you have 0,1,2,3,4 you also have the distribution of your values to consider, normal kriging assumes
    Message 1 of 3 , Apr 23, 2005
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      gianni,

      what about subtracting 1 from your values, so you have 0,1,2,3,4
      you also have the distribution of your values to consider, normal kriging
      assumes normally distributed data, you might be interested in indicator
      methods, such as indicator kriging, or multiple indicator kriging,

      Regards Digby

      ----- Original Message -----
      From: "gianni" <gianni.conte@...>
      To: <ai-geostats@...>
      Sent: Thursday, April 21, 2005 6:24 AM
      Subject: [ai-geostats] gslib postik and cpdf


      Hi
      I'm italian student from Rome and i would want to give my excuses
      for my poor english in the first place.

      I have a problem with the gslib, i would know how to postprocess the
      cpdf values that the ik3d gives when we use the categorical variables,
      because the postik seems to work only with continuous variables.


      I have 1 categorical variable, with 5 possible outcomes s=1,2,3,4,5.
      I would allocate locations to the category with the largest p under
      the constraint of reproduction of global proportion. That is the
      Soares algorithm, but i I have chosen this one because this is the
      only i found (Goovaerts97) and you could suggest me another one.
      However I need some fortran libraries about that.

      Let me do another question
      This variable is the transmissivity, and i deduced this 5 outcomes
      from very low to very high.
      How about using this information like a continuous variable in ik3d?
      How to fix the first threshold? If i fix the first zk=1 i have in
      every location the I(u;zk)=1.

      Thanks for your time
      Regards




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