kyphosis | R Documentation |
The kyphosis
data frame has 81 rows and 4 columns.
representing data on children who have had corrective spinal surgery
kyphosis
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.
John M. Chambers and Trevor J. Hastie eds. (1992) Statistical Models in S, Wadsworth and Brooks/Cole, Pacific Grove, CA.
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)
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