Outlier - How do you define outliers?

Q: How do you define outliers?

An outlier is an observation that lies an abnormal distance from other values in a random sample from a population. In a sense, this definition leaves it up to the analyst (or a consensus process) to decide what will be considered abnormal.

Answer

When a value in a random sample deviates significantly from the mean or median, we say that the observation is an outlier. With this approach, the analyst (or a consensus process) is essentially left to their own devices to determine what constitutes abnormality.

Outlier - How do you define outliers?

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