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Relative Average Deviation - RAD

  1. Sep 23, 2005 #1
    I know that RAD is used to expression precision, and I know the formula for it:

    Per mil RAD = (abs. deviation)/mean X (1000) for parts per thousand.

    Once you find the relative average deviation--this number in ppt--what is the significance of it? What is it supposed to tell you about the data? What does this number represent?? :uhh:

    This is probably an elementary topic, but I can't seem to grasp a concrete definition and how it applies to experimental data.

  2. jcsd
  3. Sep 24, 2005 #2


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    The (abs. deviation)/mean part is similar to the concept of coefficient of variation. The (1000) ppt part is just rescaling (similar to expressing 0.1 as 10%).
    Last edited: Sep 24, 2005
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