public void NegativeBinomialConstructorTest() { double expected, actual; { NegativeBinomialDistribution target = new NegativeBinomialDistribution(6, 0.42); actual = target.ProbabilityMassFunction(-1); expected = 0.0; Assert.AreEqual(expected, actual, 1e-7); Assert.IsFalse(Double.IsNaN(actual)); actual = target.ProbabilityMassFunction(0); expected = 0.00548903; Assert.AreEqual(expected, actual, 1e-7); Assert.IsFalse(Double.IsNaN(actual)); actual = target.ProbabilityMassFunction(1); expected = 0.0191018; Assert.AreEqual(expected, actual, 1e-7); Assert.IsFalse(Double.IsNaN(actual)); actual = target.ProbabilityMassFunction(2); expected = 0.0387767; Assert.AreEqual(expected, actual, 1e-7); Assert.IsFalse(Double.IsNaN(actual)); actual = target.ProbabilityMassFunction(10); expected = 0.0710119; Assert.AreEqual(expected, actual, 1e-7); Assert.IsFalse(Double.IsNaN(actual)); } }
public void ConstructorTest() { // Create a Negative Binomial distribution with r = 7, p = 0.42 var dist = new NegativeBinomialDistribution(failures: 7, probability: 0.42); // Common measures double mean = dist.Mean; // 5.068965517241379 double median = dist.Median; // 5.0 double var = dist.Variance; // 8.7395957193816862 // Cumulative distribution functions double cdf = dist.DistributionFunction(k: 2); // 0.19605133020527743 double ccdf = dist.ComplementaryDistributionFunction(k: 2); // 0.80394866979472257 // Probability mass functions double pmf1 = dist.ProbabilityMassFunction(k: 4); // 0.054786846293416853 double pmf2 = dist.ProbabilityMassFunction(k: 5); // 0.069908015870399909 double pmf3 = dist.ProbabilityMassFunction(k: 6); // 0.0810932984096639 double lpmf = dist.LogProbabilityMassFunction(k: 2); // -2.3927801721315989 // Quantile function int icdf1 = dist.InverseDistributionFunction(p: 0.17); // 2 int icdf2 = dist.InverseDistributionFunction(p: 0.46); // 4 int icdf3 = dist.InverseDistributionFunction(p: 0.87); // 8 // Hazard (failure rate) functions double hf = dist.HazardFunction(x: 4); // 0.10490438293398294 double chf = dist.CumulativeHazardFunction(x: 4); // 0.64959916255036043 // String representation string str = dist.ToString(CultureInfo.InvariantCulture); // "NegativeBinomial(x; r = 7, p = 0.42)" Assert.AreEqual(5.068965517241379, mean); Assert.AreEqual(5.0, median); Assert.AreEqual(8.7395957193816862, var); Assert.AreEqual(0.64959916255036043, chf, 1e-10); Assert.AreEqual(0.19605133020527743, cdf); Assert.AreEqual(0.054786846293416853, pmf1); Assert.AreEqual(0.069908015870399909, pmf2); Assert.AreEqual(0.0810932984096639, pmf3); Assert.AreEqual(-3.8297538146412009, lpmf); Assert.AreEqual(0.10490438293398294, hf); Assert.AreEqual(0.80394866979472257, ccdf); Assert.AreEqual(2, icdf1); Assert.AreEqual(4, icdf2); Assert.AreEqual(8, icdf3); Assert.AreEqual("NegativeBinomial(x; r = 7, p = 0.42)", str); var range1 = dist.GetRange(0.95); var range2 = dist.GetRange(0.99); var range3 = dist.GetRange(0.01); Assert.AreEqual(1, range1.Min); Assert.AreEqual(11.0, range1.Max); Assert.AreEqual(0, range2.Min); Assert.AreEqual(14, range2.Max); Assert.AreEqual(0, range3.Min); Assert.AreEqual(14, range3.Max); }
public void pdf() { NegativeBinomialDistribution dist = UnivariateDistributionInfo.CreateInstance <NegativeBinomialDistribution>(); Assert.AreEqual(0.5, dist.ProbabilityOfSuccess); Assert.AreEqual(1, dist.NumberOfFailures); double median = dist.Median; Assert.AreEqual(0, median); int middle = (int)median; double pdf = dist.ProbabilityMassFunction(middle); double lpdf = dist.LogProbabilityMassFunction(middle); Assert.AreEqual(Math.Log(pdf), lpdf, 1e-10); Assert.AreEqual(pdf, Math.Exp(lpdf), 1e-10); }
public void ConstructorTest() { #region doc_example // Create a Negative Binomial distribution with r = 7, p = 0.42 var dist = new NegativeBinomialDistribution(failures: 7, probability: 0.42); // Common measures double mean = dist.Mean; // 5.068965517241379 double median = dist.Median; // 9.0 double var = dist.Variance; // 8.7395957193816862 // Cumulative distribution functions double cdf = dist.DistributionFunction(k: 2); // 0.033380251139644379 double ccdf = dist.ComplementaryDistributionFunction(k: 2); // 0.96661974886035562 // Probability mass functions double pmf1 = dist.ProbabilityMassFunction(k: 4); // 0.054786846293416853 double pmf2 = dist.ProbabilityMassFunction(k: 5); // 0.069908015870399909 double pmf3 = dist.ProbabilityMassFunction(k: 6); // 0.0810932984096639 double lpmf = dist.LogProbabilityMassFunction(k: 2); // -2.3927801721315989 // Quantile function int icdf = dist.InverseDistributionFunction(p: cdf); // 2 int icdf1 = dist.InverseDistributionFunction(p: 0.17); // 5 int icdf2 = dist.InverseDistributionFunction(p: 0.46); // 9 int icdf3 = dist.InverseDistributionFunction(p: 0.87); // 15 // Hazard (failure rate) functions double hf = dist.HazardFunction(x: 4); // 0.062681673912893129 double chf = dist.CumulativeHazardFunction(x: 4); // 0.13461898882526471 // String representation string str = dist.ToString(CultureInfo.InvariantCulture); // "NegativeBinomial(x; r = 7, p = 0.42)" #endregion double[] probabilities = new double[10]; for (int i = 0; i < probabilities.Length; i++) { probabilities[i] = dist.DistributionFunction(i); } Assert.AreEqual(5.068965517241379, mean); Assert.AreEqual(9.0, median); Assert.AreEqual(8.7395957193816862, var); Assert.AreEqual(0.13461898882526471, chf, 1e-10); Assert.AreEqual(0.033380251139644379, cdf); Assert.AreEqual(0.054786846293416853, pmf1); Assert.AreEqual(0.069908015870399909, pmf2); Assert.AreEqual(0.0810932984096639, pmf3); Assert.AreEqual(-3.8297538146412009, lpmf); Assert.AreEqual(0.062681673912893129, hf); Assert.AreEqual(0.96661974886035562, ccdf); Assert.AreEqual(2, icdf); Assert.AreEqual(5, icdf1); Assert.AreEqual(9, icdf2); Assert.AreEqual(15, icdf3); Assert.AreEqual("NegativeBinomial(x; r = 7, p = 0.42)", str); var range1 = dist.GetRange(0.95); var range2 = dist.GetRange(0.99); var range3 = dist.GetRange(0.01); Assert.AreEqual(3, range1.Min); Assert.AreEqual(18.0, range1.Max); Assert.AreEqual(1, range2.Min); Assert.AreEqual(23, range2.Max); Assert.AreEqual(1, range3.Min); Assert.AreEqual(23, range3.Max); }