Jim,
What about MS Excel? If necessary, plot it as multiple series, or even
use auxiliary y-axis.
(You could, of course, write a Fortran routine. Or Cobal.)
wb
-----Original Message-----
From: Political Methodology Society [mailto:[log in to unmask]] On
Behalf Of Jim Battista
Sent: Monday, October 23, 2006 11:42 AM
To: [log in to unmask]
Subject: [POLMETH] Graphing / charting software enriched with
transparency/alpha-channel goodness?
So I have a multinomial logit model and want to display my results
graphically.
I can do this easily enough without confidence intervals using the xpost
tools after the estimation. Or I can use the spost tools inside Stata
to generate confidence intervals, and use rarea to plot them.
Now, I'm not ashamed of my confidence intervals. They're beautiful
confidence intervals that I'm happy to show. But, sometimes, some of
the confidence intervals overlap, which makes my existing figures
unsatisfactory. I've found the drarea package for Stata which shades
overlapped areas as the average of the two areas, but that only lets you
throw up two CI's, whereas I have three, and you can't add to it with
addplot().
Dumping the data that Stata uses to create the graphs is trivial. So is
there another graphing / charting package that will let me overlay one
CI on another with the top one such that I can still see the other one
underneath it? That will let me set a transparency value for the top
one, or that will average or sum the colors / grey values for overlapped
areas without me having to manually calculate the areas to shade them
directly? What I'd really like is something such that a light grey
overlapping a medium gray turns into a dark (=light+medium) grey.
Apologies if this is trivially easy in R. I've looked, but I am not
always the best searcher.
Jim
--
James S. Coleman Battista
Dept. of Political Science, Univ. of North Texas
[log in to unmask] (940)565-4960
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