public void ValidateInverseCumulativeDistribution(double scale, double shape, double x)
{
var n = new Pareto(scale, shape);
double cdf = 1.0 - Math.Pow(scale / x, shape);
Assert.AreEqual(x, n.InverseCumulativeDistribution(cdf), 1e-12);
Assert.AreEqual(x, Pareto.InvCDF(scale, shape, cdf), 1e-12);
}