| public Inverse ( double x ) : double | ||
| x | double | A transformed value. |
| return | double | |
public double Inverse(double x)
{
double z = B * x + A;
return 1.0 / (1.0 + Math.Exp(-z));
}
public void LogitLinkFunctionConstructorTest()
{
LogitLinkFunction target = new LogitLinkFunction();
Assert.AreEqual(0, target.A);
Assert.AreEqual(1, target.B);
for (int i = 0; i < 11; i++)
{
double x = i / 10.0;
double y = Math.Log(x) - Math.Log(1 - x);
Assert.AreEqual(y, target.Function(x), 1e-10);
Assert.AreEqual(x, target.Inverse(y), 1e-10);
}
}