rpart: kyphosis – R documentation

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kyphosis

Data on Children who have had Corrective Spinal Surgery

Description

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

Usage

kyphosis

Format

This data frame contains the following columns:

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.

Source

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

Examples

fit <- rpart(Kyphosis ~ Age + Number + Start, data = kyphosis)
fit2 <- rpart(Kyphosis ~ Age + Number + Start, data = kyphosis,
              parms = list(prior = c(0.65, 0.35), split = "information"))
fit3 <- rpart(Kyphosis ~ Age + Number + Start, data=kyphosis,
              control = rpart.control(cp = 0.05))
par(mfrow = c(1,2), xpd = TRUE)
plot(fit)
text(fit, use.n = TRUE)
plot(fit2)
text(fit2, use.n = TRUE)

rpart

Recursive Partitioning and Regression Trees

v4.1-15

GPL-2 | GPL-3

Authors

Terry Therneau [aut], Beth Atkinson [aut, cre], Brian Ripley [trl] (producer of the initial R port, maintainer 1999-2017)

Initial release

2019-04-10