Machine Learning with R Cookbook - Second Edition

There's more...

Besides adabag, the ipred package provides a bagging method for a classification tree. We demonstrate here how to use the bagging method of the ipred package to train a classification model:

1. First, you need to install and load the ipred package:

        > install.packages("ipred")
        > library(ipred)

2. You can then use the bagging method to fit the classification method:

        > churn.bagging = bagging(churn ~ ., data = trainset, coob = T)
        > churn.bagging
        Output
        Bagging classification trees with 25 bootstrap replications 
    
        Call: bagging.data.frame(formula = churn ~ ., data = trainset, coob         = T)
    
        Out-of-bag estimate of misclassification error:  0.0605  

3. Obtain an out of bag estimate of misclassification of the errors:

 > mean(predict(churn.bagging) ...