summary.rpart {rpart} | R Documentation |
Returns a detailed listing of a fitted rpart
object.
summary.rpart(object, cp=0, file, digits)
object |
fitted model object of class rpart . This is assumed to be the result
of some funciton that produces an object with the same named
components as that returned by the rpart function.
|
cp |
trim nodes with a complexity of less than cp from the listing.
|
file |
write the output to a given file name. (Full listings of a tree are often quite long). |
This function is a method for the generic function summary for class
"rpart"
. It can be invoked by calling summary
for an object of the appropriate class, or directly by calling
summary.rpart
regardless of the class of the object.
summary
, rpart.object
, printcp
.
data(car.test.frame) z.auto <- rpart(Mileage ~ Weight, car.test.frame) summary(z.auto) CP nsplit rel error xerror xstd 1 0.59535 0 1.0000 1.0197 0.17680 2 0.13453 1 0.4047 0.6141 0.10905 3 0.01283 2 0.2701 0.4711 0.08668 4 0.01000 3 0.2573 0.4710 0.08638 Node number 1: 60 observations, complexity param=0.5953 mean=24.58, MSE=22.58 left son=2 (45 obs) right son=3 (15 obs) Primary splits: Weight < 2568 to the right, improve=0.5953, (0 missing) Node number 2: 45 observations, complexity param=0.1345 mean=22.47, MSE=8.027 left son=4 (22 obs) right son=5 (23 obs) Primary splits: Weight < 3088 to the right, improve=0.5045, (0 missing) Node number 3: 15 observations mean=30.93, MSE=12.46 Node number 4: 22 observations mean=20.41, MSE=2.787 Node number 5: 23 observations, complexity param=0.01283 mean=24.43, MSE=5.115 left son=10 (15 obs) right son=11 (8 obs) Primary splits: Weight < 2748 to the right, improve=0.1477, (0 missing) Node number 10: 15 observations mean=23.8, MSE=4.027 Node number 11: 8 observations mean=25.62, MSE=4.984