Outlier

An Outlier is an observation in the data set that is not part of and is far removed from the natural clustering of the rest of the data set. It is an unusually large or an unusually small value compared to the others being measured. If an outlier is a genuine result, it is important because it might indicate an extreme of behaviour of the process under study. For this reason, all outliers must be examined carefully before embarking on any formal analysis. Outliers should not routinely be removed without further justification.

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