Artemis.Engine.Maths.SpecialFunctions.CumulativeNormalDistribution C# (CSharp) Метод

        public static double CumulativeNormalDistribution(double a)
        {
            double x, y, z;

            x = a*SQRTH;
            z = Math.Abs(x);

            if (z < SQRTH) y = 0.5 + 0.5*Erf(x);
            else
            {
                y = 0.5*Erfc(z);
                if (x > 0) y = 1.0 - y;
            }

            return y;
        }