public void CumulativeFunctionTest()
{
InverseGaussianDistribution g = new InverseGaussianDistribution(1.2, 4.2);
double expected = 0.030679;
double actual = g.DistributionFunction(0.42);
Assert.AreEqual(expected, actual, 1e-6);
Assert.IsFalse(double.IsNaN(actual));
}