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st: -diplot- available on SSC
Thanks to Kit Baum, a -diplot- package
is now available from SSC. Stata 9 is required.
-di- stands for "double interval", which in
turn is best explained by example. Many of my
colleagues are interested in sea level change
over the last several thousand years. Standard
data include estimates of (y) what the sea level
was (relative to present) at (x) various dates, but
both these variables are measured with error.
Consequently there is interest in showing
interval estimates graphically on both of two
-diplot- supports various shapes, all of which
depend on new -twoway- plottypes, added in Stata 9.
Although not advertised as a possibility in the help,
some may wish to experiment
with this as a way of getting proportional symbols
without using weights. Note, however, that the main
idea is specifying symbol sizes in terms of the
data, not in terms of size of symbol on the graph.
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