rsq.rpart               package:rpart               R Documentation

Plots the Approximate R-Square for the Different Splits

Description:

     Produces 2 plots.  The first plots the r-square (apparent and
     apparent - from cross-validation) versus the number of splits.  
     The second plots the Relative Error(cross-validation) +/- 1-SE
     from cross-validation versus the number of splits.

Usage:

     rsq.rpart(x)

Arguments:

       x: 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. 

Side Effects:

     Two plots are produced.

Note:

     The labels are only appropriate for the '"anova"' method.

Examples:

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

