Outliers are the values that, compared to others, are particularly extreme (a value clearly distant from the other available observations). The presence of outliers causes a hindrance because they tend to distort the results of data analysis, in particular in descriptive statistics and correlations. It is ideal to identify these outliers in the data cleaning phase itself; however, they can also be dealt with in the next step of the data analysis. Outliers can be univariate when they have an extreme value for a single variable, or multivariate when they have an unusual combination of values for a number of variables.
Outliers are the extreme values of a distribution that are characterized by being extremely high or extremely low compared to the rest of the distribution, thus representing isolated cases in respect to the rest of the distribution.
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