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fitoriginal
2011 Dec 27
0
Using minsplit and unequal weights in rpart
...turning for help.
Thanks in advance for your help,
-Saar
The following code shows what the issue is; the first 3 trees are the same,
but the following two (with uneven weights) turn out differently:
## playing with rpart weights
require(rpart)
dev.new()
par(mfrow=c(2,3), xpd=NA)
data(kyphosis)
fitOriginal <- rpart(Kyphosis ~ Age + Number + Start, data=kyphosis,
control=rpart.control(minsplit=15))
plot(fitOriginal)
text(fitOriginal, use.n=TRUE)
# this dataset is the original data repeated 3 times
kyphosisRepeated <- rbind(kyphosis, kyphosis, kyphosis)
fitRepeated <- rpart(Kyphosis ~ Age +...