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RE: st: graphs


From   "Victor, Jennifer Nicoll" <jnvictor@pitt.edu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   RE: st: graphs
Date   Mon, 15 Dec 2008 11:27:05 -0500

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:  jnvictor@pitt.edu
Homepage:  http://www.pitt.edu/~jnvictor


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
Sent: Sunday, December 14, 2008 11:11 AM
To: statalist@hsphsun2.harvard.edu
Subject: RE: st: graphs

I meant -mrunning- from the Stata Journal, as David points out. 

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

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 
n.j.cox@durham.ac.uk 

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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