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AI-GEOSTATS: Re: How to use CV

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  • Isobel Clark
    Hi Ian The CV is useful if you are measuring things which can only take positive values and tend to be positively skewed - i.e. lumped towards the zero. In
    Message 1 of 3 , Jan 23, 2004
      Hi Ian

      The CV is useful if you are measuring things which can
      only take positive values and tend to be 'positively'
      skewed - i.e. lumped towards the zero. In that case,
      the standard deviation itself is not a measure of
      spread but something rather more complex. The CV is a
      simple measure of skewness under these conditions.

      In general:

      CV<1/3 might not be skewed

      CV around 1, moderately skewed

      CV much above 1, highly skewed

      The CV is directly related to the standard deviation
      of the logarithms in a lognormal situation.

      Does this help?

      Isobel Clark
      http://geoecosse.bizland.com/whatsnew.htm



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