public void ConstructorTest2() { var weilbull = new WeibullDistribution(scale: 0.42, shape: 1.2); double mean = weilbull.Mean; // 0.39507546046784414 double median = weilbull.Median; // 0.30945951550913292 double var = weilbull.Variance; // 0.10932249666369542 double mode = weilbull.Mode; // 0.094360430821809421 double cdf = weilbull.DistributionFunction(x: 1.4); // 0.98560487188700052 double pdf = weilbull.ProbabilityDensityFunction(x: 1.4); // 0.052326687031379278 double lpdf = weilbull.LogProbabilityDensityFunction(x: 1.4); // -2.9502487697674415 double ccdf = weilbull.ComplementaryDistributionFunction(x: 1.4); // 0.22369885565908001 double icdf = weilbull.InverseDistributionFunction(p: cdf); // 1.400000001051205 double hf = weilbull.HazardFunction(x: 1.4); // 1.1093328057258516 double chf = weilbull.CumulativeHazardFunction(x: 1.4); // 1.4974545260150962 string str = weilbull.ToString(CultureInfo.InvariantCulture); // Weibull(x; λ = 0.42, k = 1.2) double imedian = weilbull.InverseDistributionFunction(p: 0.5); Assert.AreEqual(0.39507546046784414, mean); Assert.AreEqual(0.30945951550913292, median); Assert.AreEqual(0.094360430821809421, mode, 1e-10); Assert.AreEqual(0.3094595, imedian, 1e-5); Assert.AreEqual(0.10932249666369542, var); Assert.AreEqual(1.4974545260150962, chf); Assert.AreEqual(0.98560487188700052, cdf); Assert.AreEqual(0.052326687031379278, pdf); Assert.AreEqual(-2.9502487697674415, lpdf); Assert.AreEqual(1.1093328057258516, hf); Assert.AreEqual(0.22369885565908001, ccdf); Assert.AreEqual(1.40, icdf, 1e-6); Assert.AreEqual("Weibull(x; λ = 0.42, k = 1.2)", str); var range1 = weilbull.GetRange(0.95); var range2 = weilbull.GetRange(0.99); var range3 = weilbull.GetRange(0.01); Assert.AreEqual(0.035342687605397792, range1.Min); Assert.AreEqual(1.0479366931850318, range1.Max); Assert.AreEqual(0.0090865355213001313, range2.Min); Assert.AreEqual(1.4995260942223139, range2.Max); Assert.AreEqual(0.0090865355213001677, range3.Min); Assert.AreEqual(1.4995260942223139, range3.Max); }
public void MedianTest() { WeibullDistribution target = new WeibullDistribution(1.52, 0.6); Assert.AreEqual(target.Median, target.InverseDistributionFunction(0.5), 1e-8); }