Greg Blevins wrote:
Dear R Masters,

I have searched high and low (the help archives and my various R reference 
material and help files) for a solution to what appears to me to be quite a 
simple problem.  In the following syntax, variable n10 has three levels.  I 
would like the symbols that appear in the graph for these three levels to be 
different colors.  The best I have been able to do is to have the Key display 
three colors, but the symbols in the graph only show up in black and white.  
Any suggestions?

par(cex=.8)
s <- summary(n10 ~ n13, method="reverse", test=T)
plot(s, dotsize=1.2, cex.labels=.7, cex.axis=.5, cex.main=.5, 
which="categorical")
Key(locator(1))

R version 2.0.1
Windows XP

Thank you,

Greg Blevins
The Market Solutions Group

Greg,

These kinds of questions are probably best directed at package maintainers.

This would be an enhancement to the dotchart2 function used by plot.summary.formula.reverse, and the addition of a new argument to it from plot.... I have found symbols (esp. circle vs. triangle) to be more effective for this purpose so I am not motivated to work on this very soon but would consider it. -Frank



--
Frank E Harrell Jr   Professor and Chair           School of Medicine
                     Department of Biostatistics   Vanderbilt University

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