kyphosis {rpart}R Documentation

~~ 1-line description of the data frame ~~

Description

The kyphosis data frame has 81 rows and 4 columns. representing data on children who have had corrective spinal surgery

Arguments

Kyphosis a factor with levels absent present indicating if a kyphosis (a type of deformation) was present after the operation.
Age in months
Number the number of vertebrae involved
Start the number of the first (topmost) vertebra operated on.

Format

This data frame contains the following columns:

Source

John M. Chambers and Trevor J. Hastie eds. (1992) Statistical Models in S, Wadsworth and Brooks/Cole, Pacific Grove, CA 1992.

Examples

data(kyphosis)
fit <- rpart(Kyphosis ~ Age + Number + Start, data=kyphosis)
fit2 <- rpart(Kyphosis ~ Age + Number + Start, data=kyphosis,
              parms=list(prior=c(.65,.35), split='information'))
fit3 <- rpart(Kyphosis ~ Age + Number + Start, data=kyphosis,
              control=rpart.control(cp=.05))
par(mfrow=c(1,2))
plot(fit)
text(fit, use.n=T)
plot(fit2)
text(fit2, use.n=T)

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