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Thread: How to calculate Grubb's critical value (for an outlier test)

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    How to calculate Grubb's critical value (for an outlier test)




    Dear all,

    I'm trying to calculate Grubb's critical value to find outliers. I found a table with 100 values for alpha=0.05 http://www.sediment.uni-goettingen.d...pep-grubbs.pdf
    Further, I found this formular to calculate G-crit: ((n-1)*t-crit/sqrt(n*(df+(t-crit)^2))
    http://www.real-statistics.com/stude...-deviate-test/

    When i compare the results, I get with this formular, and the table, they don't fit. Does someone have a better formular I can use in excel or can someone say if the above mentioned formular is correct and the table is wrong?

    I also tried to use the formular mentioned in wikipedia: https://en.wikipedia.org/wiki/Grubbs...t_for_outliers
    But I had the same issues calculating the "upper critical value of the t-distribution", which did not work for me.

    Thanks in advance.

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    Re: How to calculate Grubb's critical value (for an outlier test)



  3. The Following User Says Thank You to katxt For This Useful Post:

    GretaGarbo (09-17-2017)

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