/// <summary>
/// computes points for given threshold
/// </summary>
/// <param name="threshold"></param>
/// <returns></returns>
public ConfusionMatrix ComputePoint(double threshold)
{
int truePositives = 0;
int trueNegatives = 0;
for (int i = 0; i < this.m_expected.Length; i++)
{
bool actual = (this.m_expected[i] == m_dtrueValue);
bool predicted = (this.m_prediction[i] >= threshold);
// If the prediction equals the true measured value
if (predicted == actual)
{
// We have a hit. Now we have to see
// if it was a positive or negative hit
if (predicted == true)
{
truePositives++; // Positive hit
}
else
{
trueNegatives++; // Negative hit
}
}
}
// The other values can be computed from available variables
int falsePositives = m_negativeCount - trueNegatives;
int falseNegatives = m_positiveCount - truePositives;
var cm = new ConfusionMatrix(
truePositives: truePositives, falseNegatives: falseNegatives,
falsePositives: falsePositives, trueNegatives: trueNegatives);
cm.SetCutOffValue(threshold);
return(cm);
}