Thanks Nick and David. I played around with the mrunning command a
bit. Unfortunately, it does not seem able to show how the data vary
across time for two variables with respect to the DV. I had hoped
to find a way to put this all on one graph. It seems David
suggestion of doing this in R is perhaps my only path.
To give you an example of what I'm trying to accomplish.... I have a
dependent variable that is a measure of policy specialization for a
panel of members of Congress across 34 years. I want to show how
their rates of specialization vary depending on (1) whether they
sought higher office AND (2) the relative difference in demographics
between their district and their state (such as the % of blacks).
The only way I can think to show all this on one graph is with a 3-D
graph. I guess that means using s-plus or R.
___________________________________________
Jennifer Nicoll Victor
Assistant Professor
Department of Political Science
University of Pittsburgh
4600 Wesley W. Posvar Hall
(412) 624-7204
E-mail: [email protected]
Homepage: http://www.pitt.edu/~jnvictor
-----Original Message-----
From: [email protected] [mailto:[email protected]
] On Behalf Of Nick Cox
Sent: Sunday, December 14, 2008 11:11 AM
To: [email protected]
Subject: RE: st: graphs
I meant -mrunning- from the Stata Journal, as David points out.
Nick
[email protected]
Nick Cox
David I think meant not in official Stata.
Jennifer's problem sounds, from another point of view, four-
dimensional.
Even if it is, -mrunning- from SSC offers another alternative.
Nick
[email protected]
David Airey
No, not in official data.
Often there are two dimension reductions that serve just as well.
The -
vibl- package is one example of useful two dimensional plots, where a
3 dimensional plot is a natural choice,
(http://www.ats.ucla.edu/stat/Stata/seminars/stata_vibl/vibl.pdf
).
But anyway, you have a free alternative in several R packages, such
as:
<http://www.statmethods.net/graphs/scatterplot.html>
Commercial packages like JMP 7 or 8 do this kind of plot well. Also
Data Desk 7, but development has stopped on this package.
On Dec 12, 2008, at 4:02 PM, Victor, Jennifer Nicoll wrote:
Can stata make a three-dimensional graph? I want to show how two
variables (one dichotomous and one continuous) change over time with
respect to a dependent variable. I can envision something three-
dimensional getting the point across but haven't found anything in
the manuals to lead me in that direction. Is it possible?
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