/** Average confidence score for the incorrect entities */
 public double getAverageCorrectConfidence() {
   double sum = 0.0;
   for (int i = 0; i < confidences.size(); i++) {
     EntityConfidence ec = (EntityConfidence) confidences.get(i);
     if (ec.correct()) {
       sum += ec.confidence();
     }
   }
   return sum / (double) this.numCorrect;
 }