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Re: st: graph -by- option

From   Philipp Rehm <>
Subject   Re: st: graph -by- option
Date   Tue, 11 Aug 2009 09:07:18 +0100

One possible workaround may be to add fake-observations to your dataset.

Here is an example:

sysuse auto, clear
set obs `=_N+1'
replace foreign = 0.5 in `=_N'
twoway scatter rep78 mpg, by(foreign, cols(3))


Maarten buis wrote:
--- On Mon, 10/8/09, Jeph Herrin wrote:
I am making a series of graphs, each of which
includes of a -by- over a 3 valued variable Z.
Three plots are produced in a single row.

For some graphs, the second value of Z (Z=2) has
no data, so there are only 2 plots. I would like
-by- to produce a 1x3 layout, with -hole(2)-, but
this doesn't seem to be doable. I have only been
able to produce either 1) 2 plots, with no hole
in the middle or 2) 3 plots, the center one with no
data. Is there a way to trick -by- into leaving a
hole in the middle position?

I realize that -graph combine- might solve this
problem, but it has a separate problem in that
I cannot omit the axes between plots.

I have no solution, just an example of what I expected to produce the graphs you want (two graphs in a row with a blank spot in the middle), but didn't. Maybe this example code inspires someone.

*------- begin example -----------
sysuse auto, clear
twoway scatter rep78 mpg, ///
   by(foreign, cols(3) holes(2))
*--------- end example -----------

Hope this helps,

Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen

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