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Thread: Chosing 2 data out of 4

  1. #1
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    Chosing 2 data out of 4

    I need some suggestion.
    I am working at laboratory that uses mostly ASTM and ISO methods for coal analysis.
    For any test sample I make 2 analysis. Then take average result if difference between them is less then repatability limit of the test methods.
    Or 2 make two more analysis. Finally I have 4 results.
    I am comfused at this point.

    Sample data:
    Result 1: 0,50
    Result 2: 0,30
    Method repatability limit: (average)*0,03+0,02=0,032
    Result 3: 0,29
    Result 4: 0,31

    It is obvius that there is problem at result 1. Some corrective action taken.
    What statiscal method should I use to choose two data. I think grubbs need minimum seven to eliminate outlier.

  2. #2
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    rogojel's Avatar
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    Re: Chosing 2 data out of 4

    you might want to try the interquartile range test from Tukey - as described here https://en.wikipedia.org/wiki/Outlier#Tukey.27s_test

    As, you generally have 4 data points, this should be natural.


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    therdem (12-30-2016)

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