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 0.5953 0 1.0000 1.0078 0.17510 2 0.1345 1 0.4047 0.4983 0.07396 3 0.0100 2 0.2701 0.3946 0.06354 Node number 1: 60 observations, complexity param=0.5953 mean=24.58 , SS/n=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 , SS/n=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 , SS/n=12.46 Node number 4: 22 observations mean=20.41 , SS/n=2.787 Node number 5: 23 observations mean=24.43 , SS/n=5.115