public void toASCII(StringBuilder sb) {
aucdata.toASCII(sb);
}
protected ArrayList<AUCPoint> getAUCPointsFromData(List<AUCData> aucDataList) {
double truePositives = 0;
double trueNegatives = 0;
double falsePositives = 0;
double falseNegatives = 0;
ArrayList<AUCPoint> aucPoints = new ArrayList<AUCPoint>();
double threshold = 0.0;
for (AUCData aucData : aucDataList) {
if (aucData.getClassification().equals(positiveClassification)) {
truePositives += aucData.getWeight();
} else {
falsePositives += aucData.getWeight();
}
}
// iterate through each data point updating all points that are changed by the threshold
for (AUCData aucData : aucDataList) {
if (threshold != aucData.getProbability()) {
aucPoints.add(getAUCPoint(truePositives, falsePositives, trueNegatives, falseNegatives));
threshold = aucData.getProbability();
}
// we are positive but guessing negative
if (aucData.getClassification().equals(positiveClassification)) {
// add a false negative
falseNegatives += aucData.getWeight();
// remove true positive from previous threshold
truePositives -= aucData.getWeight();
} else { // we are negative and guessing negative
// add a true negative
trueNegatives += aucData.getWeight();
// remove a false positive from previous threshold
falsePositives -= aucData.getWeight();
}
}
// add last point
aucPoints.add(getAUCPoint(truePositives, falsePositives, trueNegatives, falseNegatives));
return aucPoints;
}
@Override
public boolean toHTML(StringBuilder sb) {
return aucdata.toHTML(sb);
}
