public void ValidateDensityLn(double scale, double x)
{
var n = new Rayleigh(scale);
double expected = Math.Log(x / (scale * scale)) - (x * (x / (2.0 * (scale * scale))));
Assert.AreEqual(expected, n.DensityLn(x));
Assert.AreEqual(expected, Rayleigh.PDFLn(scale, x));
}
