A box plot is an expedient way of graphically representing groups of data through their five-number summaries: smallest observation (sample minimum), lower quartile (Q1), median, upper quartile (Q3), and largest observation (sample maximum). This helps show spread, skewdness, as well as any potential outliers. This box plot shows minimum relative channel elevations for each channel type.
http://www.colorado.edu/research/cires/banff/pubpapers/42/Poole03.gif
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