A value far from the rest of a collection can be an error, an unusual but real event, or a clue that several different groups have been mixed. Its appearance alone does not settle the explanation.
Inspect the original record and the method that produced it. Check units, entry rules, and surrounding observations. Avoid removing a value solely because the chart becomes tidier without it.
If a value is excluded for a justified reason, record the rule and consider how the result changes with it included. An unusual observation becomes useful when the investigation is transparent enough for someone else to understand the decision.
Picture this situation.
Imagine one file showing a surprisingly large size. Check whether it contains a different kind of material before treating the value as a mistake.
A second way to look.
Treat an unexpected value as the start of an investigation. Its source and context matter before you decide whether to remove it or build a story around it.
- Inspect the source and measurement method.
- Check units and entry rules.
- Document any exclusion and its effect.
Follow a related question
Distinguish prompts from finished answers.
A template with room to thinkRead the task and scoring method.
A benchmark measures a defined taskKeep learning
Related background to continue exploring this subject.
W3C: a primer for tabular data RFC Editor: the CSV format
