Speaking Stata: Graphing subsets
Nicholas J. Cox
Department of Geography
Durham University
Durham, UK
[email protected]
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Abstract. Graphical comparison of results for two or more groups or subsets can
be accomplished by way of subdivision, superimposition, or juxtaposition. The
choice between superimposition (several groups in one panel) and juxtaposition
(several groups in several panels) can require fine discrimination: while juxtaposition
increases clarity, it requires mental superimposition to be most effective.
Discussion of this dilemma leads to exploration of a compromise design in which
each subset is plotted in a separate panel, with the rest of the data as a backdrop.
Univariate and bivariate examples are given, and associated Stata coding tips and
tricks are commented on in detail.
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Nicholas J. Cox
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graphics, subdivision, superimposition, juxtaposition, quantile plots, Gumbel distribution, scatterplots
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