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Finding error percentages

  1. Mar 10, 2015 #1

    I have 3 values for data set 1 (1a, 1b, 1c), and 3 values for data set 2 (2a, 2b, 2c). (assume set 1 are the ones being compared to)

    I know that to work out the error percentage for 1a and 2a -- it is the difference (of 1a and 2a) divided by 1a x 100.

    I can do the same with 1b and 2b, and 1c, and 2c.

    However, I need to work out the OVERALL error percentage for the data set 2, compared to 1.

    How can this be done?


  2. jcsd
  3. Mar 10, 2015 #2


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    Science Advisor

    Overall error is too vague. My guess (since I am not sure what it means) would be to use the averages for both data sets and compare.
  4. Mar 10, 2015 #3


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    Gold Member

    There is no unique way to do that, and it depends what you mean by "overall error" and what you use it for
    - you could just take the average, taking sign into account
    - or the average of the absolute values
    - or (perhaps the more common meaning), the square root of the sum of squared errors
    - or many others;).
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