Summarize a Fitted Rpart Object

Usage

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

Arguments

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).

Description

Returns a detailed listing of a fitted rpart object.

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, summary.tree, print.tree, printcp.

Examples

data(car.test.frame)
z.auto <- rpart(Mileage ~ Weight, car.test.frame)
summary(z.auto)

      CP nsplit rel error xerror    xstd 
1 0.5953      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

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