public void NoNullCollection()
{
Assert.Throws <ArgumentNullException>(delegate {
var stats = new WelfordVariance(null);
});
Assert.Throws <ArgumentNullException>(delegate {
var stats = new WelfordVariance();
stats.AddRange(null);
});
}
public void Example5()
{
var stats = new WelfordVariance(new double[] { 2, 2, 5, 7 });
Assert.Equal(4, stats.Count);
Assert.Equal(4, stats.Mean, 15);
Assert.Equal(4.5, stats.Variance, 15);
Assert.Equal(6, stats.SampleVariance, 15);
Assert.Equal(2.121320343559642, stats.StandardDeviation, 15);
Assert.Equal(2.449489742783178, stats.SampleStandardDeviation, 15);
Assert.Equal(0.612372435695794, stats.RelativeStandardDeviation, 15);
}
public void NoValue()
{
var stats = new WelfordVariance();
Assert.Equal(0, stats.Count);
Assert.Equal(double.NaN, stats.Mean);
Assert.Equal(double.NaN, stats.Variance);
Assert.Equal(double.NaN, stats.SampleVariance);
Assert.Equal(double.NaN, stats.StandardDeviation);
Assert.Equal(double.NaN, stats.SampleStandardDeviation);
Assert.Equal(double.NaN, stats.RelativeStandardDeviation);
}
public void Example6()
{
var stats = new WelfordVariance();
stats.AddRange(new double[] { 2, 4, 4, 4, 5, 5, 7, 9 });
Assert.Equal(8, stats.Count);
Assert.Equal(5, stats.Mean, 15);
Assert.Equal(4, stats.Variance, 15);
Assert.Equal(4.571428571428571, stats.SampleVariance, 15);
Assert.Equal(2, stats.StandardDeviation, 15);
Assert.Equal(2.138089935299395, stats.SampleStandardDeviation, 15);
Assert.Equal(0.427617987059879, stats.RelativeStandardDeviation, 15);
}
public void Example10()
{
var stats = new WelfordVariance();
stats.AddRange(new double[] { -1, 0, 1 });
Assert.Equal(3, stats.Count);
Assert.Equal(0, stats.Mean, 15);
Assert.Equal(0.666666666666667, stats.Variance, 15);
Assert.Equal(1, stats.SampleVariance, 15);
Assert.Equal(0.816496580927726, stats.StandardDeviation, 15);
Assert.Equal(1, stats.SampleStandardDeviation, 15);
Assert.Equal(double.PositiveInfinity, stats.RelativeStandardDeviation, 15);
}
public void Example9()
{
var stats = new WelfordVariance();
stats.AddRange(new double[] { -5, -3, -1, 1, 3 });
Assert.Equal(5, stats.Count);
Assert.Equal(-1, stats.Mean, 15);
Assert.Equal(8, stats.Variance, 15);
Assert.Equal(10, stats.SampleVariance, 15);
Assert.Equal(2.82842712474619, stats.StandardDeviation, 15);
Assert.Equal(3.16227766016838, stats.SampleStandardDeviation, 15);
Assert.Equal(3.16227766016838, stats.RelativeStandardDeviation, 15);
}
public void Example8()
{
var stats = new WelfordVariance();
stats.AddRange(new double[] { 51.3, 55.6, 49.9, 52.0 });
Assert.Equal(4, stats.Count);
Assert.Equal(52.2, stats.Mean, 15);
Assert.Equal(4.425000000000004, stats.Variance, 15);
Assert.Equal(5.900000000000006, stats.SampleVariance, 15);
Assert.Equal(2.103568396796264, stats.StandardDeviation, 15);
Assert.Equal(2.428991560298225, stats.SampleStandardDeviation, 15);
Assert.Equal(0.046532405369698, stats.RelativeStandardDeviation, 15);
}
public void Example7()
{
var stats = new WelfordVariance();
stats.AddRange(new double[] { 9, 2, 5, 4, 12, 7, 8, 11, 9, 3, 7, 4, 12, 5, 4, 10, 9, 6, 9, 4 });
Assert.Equal(20, stats.Count);
Assert.Equal(7, stats.Mean, 15);
Assert.Equal(8.9, stats.Variance, 15);
Assert.Equal(9.368421052631579, stats.SampleVariance, 15);
Assert.Equal(2.983286778035260, stats.StandardDeviation, 15);
Assert.Equal(3.060787652326044, stats.SampleStandardDeviation, 15);
Assert.Equal(0.437255378903721, stats.RelativeStandardDeviation, 15);
}
public void NoInfinity()
{
var stats = new WelfordVariance();
Assert.Throws <ArgumentOutOfRangeException>(delegate {
stats.Add(double.NegativeInfinity);
});
Assert.Throws <ArgumentOutOfRangeException>(delegate {
stats.Add(double.PositiveInfinity);
});
Assert.Throws <ArgumentOutOfRangeException>(delegate {
stats.Add(double.NaN);
});
}
public void TwoValues()
{
var stats = new WelfordVariance();
stats.Add(1);
stats.Add(2);
Assert.Equal(2, stats.Count);
Assert.Equal(1.5, stats.Mean, 15);
Assert.Equal(0.25, stats.Variance, 15);
Assert.Equal(0.5, stats.SampleVariance, 15);
Assert.Equal(0.5, stats.StandardDeviation, 15);
Assert.Equal(0.707106781186548, stats.SampleStandardDeviation, 15);
Assert.Equal(0.471404520791032, stats.RelativeStandardDeviation, 15);
}
public void Example1()
{
var stats = new WelfordVariance();
stats.Add(4);
stats.Add(7);
stats.Add(13);
stats.Add(16);
Assert.Equal(4, stats.Count);
Assert.Equal(10, stats.Mean, 15);
Assert.Equal(22.5, stats.Variance, 15);
Assert.Equal(30, stats.SampleVariance, 15);
Assert.Equal(4.743416490252569, stats.StandardDeviation, 15);
Assert.Equal(5.477225575051661, stats.SampleStandardDeviation, 15);
Assert.Equal(0.547722557505166, stats.RelativeStandardDeviation, 15);
}
public void Example4()
{
var stats = new WelfordVariance();
stats.Add(6);
stats.Add(2);
stats.Add(3);
stats.Add(1);
Assert.Equal(4, stats.Count);
Assert.Equal(3, stats.Mean, 15);
Assert.Equal(3.5, stats.Variance, 15);
Assert.Equal(4.666666666666667, stats.SampleVariance, 15);
Assert.Equal(1.870828693386971, stats.StandardDeviation, 15);
Assert.Equal(2.160246899469287, stats.SampleStandardDeviation, 15);
Assert.Equal(0.720082299823096, stats.RelativeStandardDeviation, 15);
}
