Measure to compare true observed labels with predicted labels in binary classification tasks.
True (observed) labels. Must have the exactly same two levels and the same length as
Predicted response labels. Must have the exactly same two levels and the same length as
Name of the positive class.
Additional arguments. Currently ignored.
This measure counts the false positives (type 1 error), i.e. the number of predictions indicating a positive class label while in fact it is negative.