Last data update: 2014.03.03
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R: Data on Children who have had Corrective Spinal Surgery
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)
Results
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