Speaking Stata: Creating and varying box plots
Nicholas J. Cox
Department of Geography
Durham University
Durham City, UK
[email protected]
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Abstract. Box plots have been a standard statistical graph since John W. Tukey
and his colleagues and students publicized them energetically in the 1970s. In
Stata, graph box and graph hbox are commands available to draw box plots, but
sometimes neither is sufficiently flexible for drawing some variations on standard
box plot designs. This column explains how to use egen to calculate the statistical
ingredients needed for box plots and twoway to re-create the plots themselves. That
then allows variations such as adding means, connecting medians, or showing all
data points beyond certain quantiles.
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Nicholas J. Cox
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box plots, dispersion diagrams, distributions, egen, graphics, percentile, quantile, range bars, twoway
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