On Sun, 4 Mar 2012, yindalon wrote:
I run the following code:
library(rpart)
data(kyphosis)
fit <- rpart(Kyphosis ~ ., data=kyphosis)
plot(fit)
text(fit, use.n=TRUE)
The text labels represent the count of each class at the leaf node.
Unfortunately, the numbers are rounded and in scientific notation rather
than the exact number of examples sorted by that node in each class.
You probably have a getOption("digits") of 4 or lower. text.rpart uses
getOption("digits") - 3 as the default which then means only 1 significant
digit and hence it rounds and uses scientific notation. Using
text(fit, use.n = TRUE, digits = 3)
should do the trick. Maybe adding setting xpd = TRUE in addition helps in
avoiding clipping of some labels.
Also, I would recommend to use
library("partykit")
plot(as.party(fit))
for visualization which uses a display like for the ctree() function (also
mentioned on the web page you quote below).
The plot is supposed to look like
http://www.statmethods.net/advstats/images/ctree.png as per
http://www.statmethods.net/advstats/cart.html.
I'm running 2.14.1 on a mac.
Can anyone verify or point out if I am doing something obviously wrong for
displaying the counts rounded and in scientific notation rather than the
true counts in each class at each node?
Thanks.
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