rpart (version 2.0-3)

summary.rpart: Summarize a Fitted Rpart Object

Description

Returns a detailed listing of a fitted rpart object.

Usage

summary.rpart(object, cp=0, digits, file, ...)

Arguments

object

fitted model object of class rpart. This is assumed to be the result of some function 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).

Details

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.

See Also

summary, rpart.object, printcp.

Examples

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