| 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, summary.tree, print.tree, 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