The interquartile range is often used to find outliers in data. Outliers here are defined as observations that fall below Q1 − 1.5 IQR or above Q3 + 1.5 IQR. In a boxplot, the highest and lowest occurring value within this limit are indicated by whiskers of the box (frequently with an additional bar at the end of the whisker) and any outliers as individual points.
https://www.purplemath.com/modules/boxwhisk3.htm https://www.linkedin.com/pulse/outlier-treatment-tukeys-method-r-swanand-marathe/
https://stackoverflow.com/questions/34535155/figure-size-in-r-markdown
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