public void TestSomeData()
{
StatisticalMoments sm = new StatisticalMoments();
for (int i = 0; i < 10; i++) { sm.Accumulate(i); }
Assert.AreEqual(10, sm.Count());
Assert.AreEqual(4.5, sm.Average());
Assert.AreEqual(82.5, sm.UnnormalizedVariance());
Assert.Greater(9.16667, sm.Variance());
Assert.Less(9.16666, sm.Variance());
Assert.AreEqual(0, sm.Skewness());
Assert.Greater(-1.19, sm.Kurtosis());
Assert.Less(-1.2, sm.Kurtosis());
}
public void TestZeros()
{
StatisticalMoments sm = new StatisticalMoments();
for (int i = 0; i < 5; i++) { sm.Accumulate(0); }
Assert.AreEqual(5, sm.Count());
Assert.AreEqual(0, sm.Average());
Assert.AreEqual(0, sm.UnnormalizedVariance());
Assert.AreEqual(0, sm.Variance());
Assert.IsNaN(sm.Skewness()); // must be NaN if variance is 0
Assert.IsNaN(sm.Kurtosis()); // must be NaN if variance is 0
}
public void TestEmptyNaN()
{
StatisticalMoments sm = new StatisticalMoments();
Assert.AreEqual(0, sm.Count());
Assert.AreEqual(0, sm.Average());
Assert.AreEqual(0, sm.UnnormalizedVariance());
Assert.IsNaN(sm.Variance());
Assert.IsNaN(sm.Skewness());
Assert.IsNaN(sm.Kurtosis());
}