public void ValidateDensityLn(double dof, double x, double expected)
{
var chi = new Chi(dof);
Assert.That(chi.DensityLn(x), Is.EqualTo(expected).Within(13));
Assert.That(Chi.PDFLn(dof, x), Is.EqualTo(expected).Within(13));
}
public void ValidateDensityLn(double dof, double x)
{
var n = new Chi(dof);
double expected = ((1.0 - (dof / 2.0)) * Math.Log(2.0)) + ((dof - 1.0) * Math.Log(x)) - (x * (x / 2.0)) - SpecialFunctions.GammaLn(dof / 2.0);
Assert.AreEqual(expected, n.DensityLn(x));
Assert.AreEqual(expected, Chi.PDFLn(dof, x));
}