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st: Graph axis labelling range


From   Nick Winter <nwinter@virginia.edu>
To   Stata List <statalist@hsphsun2.harvard.edu>
Subject   st: Graph axis labelling range
Date   Mon, 19 Feb 2007 15:02:23 -0500

Hi,

I am trying to create a "range-frame" around a scatterplot (see Tufte, Visual Display of Quantitative Information, pp 130-131). The basic idea is that the axis line is drawn only for the range of the data.

I've managed to create it (for the y-axis only in this example) as follows:

. sysuse auto

. graph twoway scatter mpg price || ///
scatteri 12 -250 41 -250, c(l) msym(none) , ///
plotregion(margin(l 0 b 0)) yscale(noline) ///
ylab(12 41, nogrid) xscale(ra(-200 15000)) ///
legend(off) yscal(ra(10 45))

But this seems like a pretty ugly way to go (and requires some ad-hoc tinkering).

I'd have thought that the yscale(noextend) option would get me where I want to go, but this command:

. graph twoway scatter mpg price , yscale(noextend)

draws a y-axis that runs from about 15.5 to 26.2. Not sure why that's happening.

Is this something someone has programmed, or on which someone has a better approach?

Thanks
Nick Winter

--
--------------------------------------------------------------
Nicholas Winter 434.924.6994 t
Assistant Professor 434.924.3359 f
Department of Politics nwinter@virginia.edu e
University of Virginia faculty.virginia.edu/nwinter w
PO Box 400787, 100 Cabell Hall
Charlottesville, VA 22904

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