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- Dictionaryout·li·er/ˈoutˌlī(ə)r/
noun
- 1. a person or thing situated away or detached from the main body or system: "less accessible islands and outliers"
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noun
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In statistics, an outlier is a data point that differs significantly from other observations. An outlier may be due to a variability in the measurement, an indication of novel data, or it may be the result of experimental error; the latter are sometimes excluded from the data set. An outlier can be an indication of exciting possibility, but can also cause serious problems in statistical analyses. Wikipedia