Generating ROC charts
When using classification techniques, we can rely on the technique to classify cases automatically. Alternately, we can rely on the technique to only generate the probabilities of cases belonging to various classes and then determine the cutoff probabilities ourselves. receiver operating characteristic (ROC) charts help with the latter approach by giving a visual representation of the true and false positives at various cutoff levels. We will use the ROCR package to generate ROC charts.
Getting ready
If you have not already installed the ROCR package, install it now. Load the data files for this chapter from the book's website and ensure that the rocr-example-1.csv and rocr-example-2.csv files are on your R working directory. ...
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