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st: -diplot- available on SSC


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: -diplot- available on SSC
Date   Mon, 13 Jun 2005 17:49:22 +0100

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 
quantitative axes. 

-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. 

Nick 
n.j.cox@durham.ac.uk 


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