public void Test_Height_Standard_Deviation()
{
List <Observation> obs = new List <Observation>()
{
new Observation {
Height = 65, Weight = 150
}
, new Observation {
Height = 68, Weight = 160
}
, new Observation {
Height = 70, Weight = 172
}
, new Observation {
Height = 72, Weight = 168
}
, new Observation {
Height = 76, Weight = 185
}
};
// 65 + 68 + 70 + 72 + 76 = 351
// 351 / 5 = 70.2 = mean
// (65 - 70.2)^2 + (68 - 70.2)^2 + (70 - 70.2)^2 + (72 - 70.2)^2 + (76 - 70.2)^2 = 68.8
// 68.8 / 5 = 13.76
// sqrt 13.76 = 3.70944
ObservationStatistics stats = ObservationStatistics.CalculateStatistics(obs);
Assert.AreEqual(3.70944, stats.HeightStandardDeviation, 0.01);
}
public void Test_Median_Weight_With_Known_Even_Item_List()
{
List <Observation> obs = new List <Observation>()
{
new Observation {
Height = 65, Weight = 150
}
, new Observation {
Height = 68, Weight = 160
}
, new Observation {
Height = 70, Weight = 172
}
, new Observation {
Height = 72, Weight = 168
}
, new Observation {
Height = 76, Weight = 185
}
, new Observation {
Height = 77, Weight = 181
}
};
// 172 + 168 =
// 340 / 2 = 170
ObservationStatistics stats = ObservationStatistics.CalculateStatistics(obs);
Assert.AreEqual(170.0f, stats.MedianWeight, 0.01);
}
public void Test_Mean_Weight_With_Known_List()
{
List <Observation> obs = new List <Observation>()
{
new Observation {
Height = 65, Weight = 150
}
, new Observation {
Height = 68, Weight = 160
}
, new Observation {
Height = 70, Weight = 172
}
, new Observation {
Height = 72, Weight = 168
}
, new Observation {
Height = 76, Weight = 185
}
};
// 150 + 160 + 172 + 168 + 185 = 835
// 835 / 5 = 167
ObservationStatistics stats = ObservationStatistics.CalculateStatistics(obs);
Assert.AreEqual(167, stats.MeanWeight, 0.01);
}
public void Test_Mean_Height_With_Known_List()
{
List <Observation> obs = new List <Observation>()
{
new Observation {
Height = 65, Weight = 150
}
, new Observation {
Height = 68, Weight = 160
}
, new Observation {
Height = 70, Weight = 172
}
, new Observation {
Height = 72, Weight = 168
}
, new Observation {
Height = 76, Weight = 185
}
};
// 65 + 68 + 70 + 72 + 76 = 351
// 351 / 5 = 70.2
ObservationStatistics stats = ObservationStatistics.CalculateStatistics(obs);
Assert.AreEqual(70.2, stats.MeanHeight, 0.01);
}
public void Test_Smallest_Weight_Observation_With_Random_List()
{
List <Observation> obs = GetRandomOrderedObservationList();
ObservationStatistics stats = ObservationStatistics.CalculateStatistics(obs);
Observation ob = GetObservationWithPredicate(obs, (Observation lhs, Observation rhs) => { return(lhs.Weight > rhs.Weight); });
Assert.AreEqual(ob.Weight, stats.LeastWeightObservation.Weight, 0.01);
}
public void Test_Largest_Height_Observation_With_Random_List()
{
List <Observation> obs = GetRandomOrderedObservationList();
ObservationStatistics stats = ObservationStatistics.CalculateStatistics(obs);
Observation ob = GetObservationWithPredicate(obs, (Observation lhs, Observation rhs) => { return(lhs.Height < rhs.Height); });
Assert.AreEqual(ob.Height, stats.GreatestHeightObservation.Height, 0.01);
}
public void Test_Median_Height_With_Known_Odd_Item_List()
{
List <Observation> obs = new List <Observation>()
{
new Observation {
Height = 65, Weight = 150
}
, new Observation {
Height = 68, Weight = 160
}
, new Observation {
Height = 70, Weight = 172
}
, new Observation {
Height = 72, Weight = 168
}
, new Observation {
Height = 76, Weight = 185
}
};
ObservationStatistics stats = ObservationStatistics.CalculateStatistics(obs);
Assert.AreEqual(70.0f, stats.MedianHeight, 0.01);
}
public void Test_ObservationStatistics_With_Null_List()
{
ObservationStatistics stats = ObservationStatistics.CalculateStatistics(null);
}
public void Test_ObservationStatistics_With_Emtpy_List()
{
ObservationStatistics stats = ObservationStatistics.CalculateStatistics(new List <Observation>());
}
