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Thread: Significant Outliers

  1. #1
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    Significant Outliers

    I have measured 4 characteristics for ~600 individuals (2 biological replicates per individuals). Some of the characteristics are not normally distributed (Anderson-Darling). I have access to minitab or microsoft excel (2010).

    Does anyone have suggestions as to what tests I could use to find significant outliers for each measured parameter?

    Thank you in advance.


  2. #2
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    Re: Significant Outliers

    What method are you running? For regression, and I assume ANOVA, the easiest way to test for outliers is to look at the standardized or studentized residuals. A value more than 3(some say 2) is usually taken as a sign of a meaningful outlier.

    I am fairly certain excel will not do this. I don't know minitab well enough to know if it will or not. I don't think, even with the analytics add on, that excel has any way to do any outlier anlysis.
    "Very few theories have been abandoned because they were found to be invalid on the basis of empirical evidence...." Spanos, 1995

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