public void ConstructorTest()
{
int populationSize = 15; // population size N
int success = 7; // number of successes in the sample
int samples = 8; // number of samples drawn from N
// Create a new Hypergeometric distribution with N = 15, n = 8, and s = 7
var dist = new HypergeometricDistribution(populationSize, success, samples);
double mean = dist.Mean; // 1.3809523809523812
double median = dist.Median; // 4.0
double var = dist.Variance; // 3.2879818594104315
double mode = dist.Mode; // 4.0
double cdf = dist.DistributionFunction(k: 2); // 0.80488799999999994
double ccdf = dist.ComplementaryDistributionFunction(k: 2); // 0.19511200000000006
double pdf1 = dist.ProbabilityMassFunction(k: 4); // 0.38073038073038074
double pdf2 = dist.ProbabilityMassFunction(k: 5); // 0.18275058275058276
double pdf3 = dist.ProbabilityMassFunction(k: 6); // 0.030458430458430458
double lpdf = dist.LogProbabilityMassFunction(k: 2); // -2.3927801721315989
int icdf1 = dist.InverseDistributionFunction(p: 0.17); // 4
int icdf2 = dist.InverseDistributionFunction(p: 0.46); // 4
int icdf3 = dist.InverseDistributionFunction(p: 0.87); // 5
int icdf4 = dist.InverseDistributionFunction(p: 0.50);
double hf = dist.HazardFunction(x: 4); // 1.7753623188405792
double chf = dist.CumulativeHazardFunction(x: 4); // 1.5396683418789763
string str = dist.ToString(CultureInfo.InvariantCulture); // "HyperGeometric(x; N = 15, m = 7, n = 8)"
Assert.AreEqual(3.7333333333333334, mean);
Assert.AreEqual(4.0, median);
Assert.AreEqual(0.99555555555555553, var);
Assert.AreEqual(4, mode);
Assert.AreEqual(1.5396683418789763, chf, 1e-10);
Assert.AreEqual(0.10023310023310024, cdf);
Assert.AreEqual(0.38073038073038074, pdf1);
Assert.AreEqual(0.18275058275058276, pdf2);
Assert.AreEqual(0.030458430458430458, pdf3);
Assert.AreEqual(-2.3927801721315989, lpdf);
Assert.AreEqual(1.7753623188405792, hf);
Assert.AreEqual(0.89976689976689972, ccdf);
Assert.AreEqual(3, icdf1);
Assert.AreEqual(4, icdf2);
Assert.AreEqual(5, icdf3);
Assert.AreEqual("HyperGeometric(x; N = 15, m = 7, n = 8)", str);
var range1 = dist.GetRange(0.95);
var range2 = dist.GetRange(0.99);
var range3 = dist.GetRange(0.01);
Assert.AreEqual(2, range1.Min);
Assert.AreEqual(5, range1.Max);
Assert.AreEqual(2, range2.Min);
Assert.AreEqual(6, range2.Max);
Assert.AreEqual(2, range3.Min);
Assert.AreEqual(6, range3.Max);
}
