Accord.Tests.Statistics.InverseChiSquareDistributionTest.ProbabilityDensityFunctionTest C# (CSharp) Method

        public void ProbabilityDensityFunctionTest()
        {
            int degreesOfFreedom;
            double actual, expected, x;
            ChiSquareDistribution target;

            degreesOfFreedom = 1;
            target = new ChiSquareDistribution(degreesOfFreedom);
            x = 1;
            actual = target.ProbabilityDensityFunction(x);
            expected = 0.2420;
            Assert.AreEqual(expected, actual, 1e-4);

            degreesOfFreedom = 2;
            target = new ChiSquareDistribution(degreesOfFreedom);
            x = 2;
            actual = target.ProbabilityDensityFunction(x);
            expected = 0.1839;
            Assert.AreEqual(expected, actual, 1e-4);

            degreesOfFreedom = 10;
            target = new ChiSquareDistribution(degreesOfFreedom);
            x = 2;
            actual = target.ProbabilityDensityFunction(x);
            expected = 0.0077;
            Assert.AreEqual(expected, actual, 1e-4);
        }