public void ValidateCumulativeDistribution(double dof, double x)
{
var n = new Chi(dof);
double expected = SpecialFunctions.GammaLowerIncomplete(dof / 2.0, x * x / 2.0) / SpecialFunctions.Gamma(dof / 2.0);
Assert.AreEqual(expected, n.CumulativeDistribution(x));
Assert.AreEqual(expected, Chi.CDF(dof, x));
}
public void ValidateCumulativeDistribution(double dof, double x, double expected)
{
var chi = new Chi(dof);
Assert.That(chi.CumulativeDistribution(x), Is.EqualTo(expected).Within(13));
Assert.That(Chi.CDF(dof, x), Is.EqualTo(expected).Within(13));
//double expected = SpecialFunctions.GammaLowerIncomplete(dof / 2.0, x * x / 2.0) / SpecialFunctions.Gamma(dof / 2.0);
//Assert.AreEqual(expected, n.CumulativeDistribution(x));
//Assert.AreEqual(expected, Chi.CDF(dof, x));
}