20.74 C5.0 Rules Performance

Here we plot the performance of the decision tree, showing a risk chart. The areas under the recall and risk curves are also reported.

predicted <- predict(model, ds[te, vars], type="prob")[,2]
riskchart(predicted, actual_te, risk_te)

An error matrix shows, clockwise from the top left, the percentages of true negatives, false positives, true positives, and false negatives.

predicted <- predict(model, ds[te, vars], type="class")
sum(ds[te, target] != predicted)/length(predicted) # Overall error rate
round(100*table(ds[te, target], predicted, dnn=c("Actual", "Predicted"))/length(predicted))

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