public void ValidateCumulativeDistribution(double mu, double lambda, double x, double f) { var n = new InverseGaussian(mu, lambda); AssertHelpers.AlmostEqualRelative(f, n.CumulativeDistribution(x), precision); AssertHelpers.AlmostEqualRelative(f, InverseGaussian.CDF(mu, lambda, x), precision); }