Machine Learning with R Cookbook - Second Edition

How to do it...

Perform the following steps to classify the telecom churn dataset with the boosting method:

1. You can use the boosting function from the adabag package to train the classification model:

        > set.seed(2)
        > churn.boost = boosting(churn ~.,data=trainset,mfinal=10,         coeflearn="Freund", boos=FALSE , control=rpart.control(maxdepth=3))

2. You can then make a prediction based on the boosted model and testing dataset:

        > churn.boost.pred = predict.boosting(churn.boost,newdata=testset)  

3. Next, you can retrieve the classification table from the predicted results:

        > churn.boost.pred$confusion
        Output
                       Observed Class
        Predicted Class yes  no
                    no   41 858
                    yes 100  19  

4. Finally, you can obtain the average errors from the predicted results:

 > churn.boost.pred$error ...