Outliers

Definition

Outliers are extreme values that significantly differ from other values in a dataset. They can greatly affect statistical analyses and should be carefully examined.

Related terms

Quartiles: Quartiles divide data into four equal parts and can help identify outliers using interquartile range.

Boxplot: A boxplot is a graphical representation of data that shows outliers as individual points outside the main distribution.

Z-Score: A z-score measures how many standard deviations an observation is from the mean and can help identify outliers.