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Some Implementations of the Boxplot
Michael Frigge, David C. Hoaglin and Boris Iglewicz
The American Statistician
Vol. 43, No. 1 (Feb., 1989), pp. 50-54
Stable URL: http://www.jstor.org/stable/2685173
Page Count: 5
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An increasing number of statistical software packages offer exploratory data displays and summaries. For one of these, the graphical technique known as the boxplot, a selective survey of popular software packages revealed several definitions. These alternative constructions arise from different choices in computing quartiles and the fences that determine whether an observation is "outside" and thus plotted individually. We examine these alternatives and their consequences, discuss related background for boxplots (such as the probability that a sample contains one or more outside observations and the average proportion of outside observations in a sample), and offer recommendations that lead to a single standard form of the boxplot.
The American Statistician © 1989 American Statistical Association