Hi everybody,
I am currently analyzing a study with SPSS. Explorative data analysis indicates that there is an extreme outlier (it is marked with a "*" in the Boxplot graph).
I learned from Google that "extreme outliers" as indicated with "*" by SPSS differ from the mean value of a population by more than 3xSTD.
However, I could not find a real source for this.
-Does Anybody know a publication that is concerned with this criterion?
-What is the name of the criterion?
Thank you for your advice,
Patrick
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