Boxplot
In statistics, a boxplot is a graphic representation. It is also called a box-and-whisker diagram.
Typically, the boxplot enables the median, the quartiles and the centiles (5^{th} and 95^{th}) or the deciles (1^{st} and 9^{th}) to be represented. Anomalous data are also often represented (outliers).
It can be found in various forms in which the minimum and maximum of a sample are represented instead of centiles or deciles.
A set of data where the quartiles, deciles and median are represented. © Bruno Scala
The diagram above shows a set of data separated into quartiles and deciles. The median is also shown.
The boxplot corresponding to this set of data (below) highlights the median, the1^{st} and 3^{rd} quartiles and the 1^{st} and 9^{th} deciles.
Graphic representation as a boxplot. In red, the median, in green, the first and third quartiles, in blue, the first and ninth deciles. The black points are outliers. © Bruno Scala