Function() public method

The Logit link function.
The inverse Logit link function is given by f(x) = (Math.Log(x / (1.0 - x)) - A) / B.
public Function ( double x ) : double
x double An input value.
return double
LogitLinkFunction Class Documentation
Esempio n. 1
0
        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);
            }
        }
Esempio n. 2
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        public void LogitLinkFunctionConstructorTest1()
        {
            double beta = 3.14;
            double constant = 2.91;

            LogitLinkFunction target = new LogitLinkFunction(beta, constant);
            Assert.AreEqual(constant, target.A);
            Assert.AreEqual(beta, target.B);

            for (int i = 0; i < 11; i++)
            {
                double x = i / 10.0;
                double y = ((Math.Log(x) - Math.Log(1 - x)) - constant) / beta;

                Assert.AreEqual(y, target.Function(x), 1e-10);
                Assert.AreEqual(x, target.Inverse(y), 1e-10);
            }
        }