On Jan 6, 2012, at 6:09 PM, Chris Conner wrote:
I'm trying to understand how to set graphical parameters for trees
created with the party package. For example take the following code:
library(party)
data(airquality)
airq <- subset(airquality, !is.na(Ozone))
airct <- ctree(Ozone ~ ., data = airq,
controls = ctree_control(maxsurrogate = 3))
plot(airct)
My problem is, I've got a ctree that has 14 terminal nodes, and as a
result of the default graphical paramters of plot(ctree), all of the
text is completely undreadable (decison node text is too large and
as a result, these nodes overlap one another, terminal node barplot
text overlaps hideously). What I would like to do is learn how to
customize the elements of these plots. For the text, I have tried
par(cex=.4, cex.main=.4, cex.axis=.2, cex.lab=.2)... to no avail.
As far as reducing the size of the node ovals, I'm completely lost
there...
After looking at:
party:::plot.BinaryTree and
party:::node_inner
... I've decided that you cannot. Neither of those function appear to
accept parameters for shrinking the text. You could of course modify
the code but if you couldn't find this answer on your own, then I have
doubts that you possess the skills. So what are you to do? My
suggestion would be to make a bigger plot on a vector graphics device
(ps, pdf) and then shrink it.
--
David Winsemius, MD
West Hartford, CT
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