Measuring Spam Filter Accuracy
Here are various schemes used to measure spam-filter accuracy. First, multiple-figure measurement schemes:
FpFnPercentages: our favourite!
BattingAverage: John Graham-Cumming's new system
PredictiveValue: how the MDs do it
PrecisionAndRecall: how text classifiers do it
Single-figure measurements:
TotalCostRatio: Ion Androutsopoulos' scheme
And measurements across a range of thresholds:
RocGraphs: the radar operator's favourite