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RE: [ai-geostats] Comparison of sample areas

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  • osei, samuel
    Hi Collins, I guess T and F tests are used for samples from TWO sampling campaigns. Please correct me if I m wrong. What Chris is referring to is more than 2
    Message 1 of 5 , Mar 1, 2006
      Hi Collins,

      I guess T and F tests are used for samples from TWO sampling campaigns.
      Please correct me if I'm wrong. What Chris is referring to is more than
      2 sampled fields.



      Thanks


      Sam



      -----Original Message-----
      From: Colin Badenhorst [mailto:CBadenhorst@...]
      Sent: Tuesday, February 28, 2006 3:01 PM
      To: C.J.Banks; ai-geostats
      Subject: RE: [ai-geostats] Comparison of sample areas

      Chris,

      How about using a "T-test" to test for similar sample means, or an
      F-test to test for similar sample variance?

      Regards,
      Colin

      -----Original Message-----
      From: C.J.Banks [mailto:C.J.Banks@...]
      Sent: 28 February 2006 14:26
      To: ai-geostats
      Subject: [ai-geostats] Comparison of sample areas

      Dear All

      I have sampled three rectangular fields within a larger area and
      measured a variable of interest at a lot of points in each of these
      fields. Values were taken from all over each of the sampled fields but
      are not necessarily over a systematic grid. I am interested in testing
      whether the three sampled fields come from the same population. However,
      an ANOVA (or other similar tests) assumes that there is no correlation
      between values within each of the sampled fields, which isn't true
      because of the spatial nature. I'm sure that similar studies have been
      done and would appreciate any pointers to useful sources or appropriate
      statistical tests.

      For those who are interested the data are depths of snow on different
      floes in the same area of the Antarctic.

      Many thanks

      Chris



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