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A value that sits unusually far from the rest of the data.
Evidence and reasoning
Definition
A value that sits unusually far from the rest of the data. It may be an error or a real and important event. Find out why it is there before you remove it.
Example
In a list of order lines for 1 to 20 parts, a line for 5,000 parts is an outlier. It could be a typing error or a genuine bulk order.
See how it works
Usual order size1–20 parts
Unusual order5,000 parts
Investigate this unusual order before deciding how to treat it.
Check your understanding
Common mistake: Outliers can be genuine events, not necessarily data errors.
Should an unusual value always be deleted?
Show explanation
No. Check the source and business context first.
For your role
Choose your role to see what this term means in your work.
Why it matters
It can reveal an error or an important opportunity.
