Box plot

median, quartiles and outliers of a group

A compact chart of a distribution: the box spans the middle 50 % of the values (first to third quartile) with a line at the median, the whiskers reach the last values within 1.5 interquartile ranges, and values beyond are drawn as outliers.

Box plots side by side compare the centre and spread of several groups at a glance.

Calculate it

Multi-Vari Chart and Box Plot: Multi-vari chart, families of variation and box plots for root cause work.

Related terms

• Multi-vari study: which family of variation is the largest