Machine Learning with R Cookbook - Second Edition

How to do it...

Perform the following steps to select features:

1. Transform the feature named as international_plan from the training dataset, trainset, to intl_yes and intl_no:

        > intl_plan = model.matrix(~ trainset.international_plan - 1,        data=data.frame(trainset$international_plan))
        > colnames(intl_plan) =         c("trainset.international_planno"="intl_no",         "trainset.international_planyes"= "intl_yes")  

2. Transform the feature named as voice_mail_plan from the training dataset, trainset, to voice_yes and voice_no:

         > voice_plan = model.matrix(~ trainset.voice_mail_plan - 1,        data=data.frame(trainset$voice_mail_plan))
        > colnames(voice_plan) =         c("trainset.voice_mail_planno" ="voice_no",        "trainset.voice_mail_planyes"="voidce_yes")

3. Remove the ...