Outlier


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Outlier - short version

(1) An observation that is many standard deviations from the mean. It is sometimes tempting to discard outliers, but this is imprudent unless the cause of the outlier can be identified, and the outlier is determined to be spurious. Otherwise, discarding outliers can cause one to underestimate the true variability of the measurement process.

(2) An outlier is a point on a chart that does not fall into the pattern of the rest of the data.



 



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