Hello all,
I'm was going through the help for
?rpart.object
And noticed some inconsistencies, Some might be a mistake in the help file
and some might be my misunderstanding.
The help in the section:
value -> frame (first paragraph), states that:
> yval, the fitted value of the response at each node, *and splits, a two
> column matrix of left and right split labels for each node. *
But from looking at the object, for example
fit1 <- rpart(Kyphosis ~ Age + Number + Start, data=kyphosis)
fit1$frame
var n wt dev yval complexity ncompete nsurrogate yval2.1
yval2.2 yval2.3 yval2.4 yval2.5
1 Start 81 81 17 1 0.17647059 2 1 1.0000000
64.0000000 17.0000000 0.7901235 0.2098765
2 Start 62 62 6 1 0.01960784 2 2 1.0000000
56.0000000 6.0000000 0.9032258 0.0967742
4 <leaf> 29 29 0 1 0.01000000 0 0 1.0000000
29.0000000 0.0000000 1.0000000 0.0000000
I can't see any "splits" column.
I'm also not sure I understand what the yval2 columns signify (even that I
read what it says in the help).
p.s: I hope I sent it to the correct e-mail.
Best,
Tal
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