public Statistics(IEnumerable <double> values)
{
OriginalValues = values.Where(d => !double.IsNaN(d)).ToArray();
SortedValues = OriginalValues.OrderBy(value => value).ToArray();
N = SortedValues.Count;
if (N == 0)
{
throw new InvalidOperationException("Sequence of values contains no elements, Statistics can't be calculated");
}
if (N == 1)
{
Q1 = Median = Q3 = SortedValues[0];
}
else
{
double GetMedian(IReadOnlyList <double> x) => x.Count % 2 == 0
? (x[x.Count / 2 - 1] + x[x.Count / 2]) / 2
: x[x.Count / 2];
Median = GetMedian(SortedValues);
Q1 = GetMedian(SortedValues.Take(N / 2).ToList());
Q3 = GetMedian(SortedValues.Skip((N + 1) / 2).ToList());
}
Min = SortedValues.First();
Mean = SortedValues.Average();
Max = SortedValues.Last();
InterquartileRange = Q3 - Q1;
LowerFence = Q1 - 1.5 * InterquartileRange;
UpperFence = Q3 + 1.5 * InterquartileRange;
AllOutliers = SortedValues.Where(IsOutlier).ToArray();
LowerOutliers = SortedValues.Where(IsLowerOutlier).ToArray();
UpperOutliers = SortedValues.Where(IsUpperOutlier).ToArray();
Variance = N == 1 ? 0 : SortedValues.Sum(d => Math.Pow(d - Mean, 2)) / (N - 1);
StandardDeviation = Math.Sqrt(Variance);
StandardError = StandardDeviation / Math.Sqrt(N);
Skewness = CalcCentralMoment(3) / StandardDeviation.Pow(3);
Kurtosis = CalcCentralMoment(4) / StandardDeviation.Pow(4);
ConfidenceInterval = new ConfidenceInterval(Mean, StandardError, N);
Percentiles = new PercentileValues(SortedValues);
}
public Statistics(IEnumerable <double> values)
{
OriginalValues = values.Where(d => !double.IsNaN(d)).ToArray();
SortedValues = OriginalValues.OrderBy(value => value).ToArray();
N = SortedValues.Count;
if (N == 0)
{
throw new InvalidOperationException("Sequence of values contains no elements, Statistics can't be calculated");
}
if (N == 1)
{
Q1 = Median = Q3 = SortedValues[0];
}
else
{
double GetMedian(IReadOnlyList <double> x) => x.Count % 2 == 0
? (x[x.Count / 2 - 1] + x[x.Count / 2]) / 2
: x[x.Count / 2];
Median = GetMedian(SortedValues);
Q1 = GetMedian(SortedValues.Take(N / 2).ToList());
Q3 = GetMedian(SortedValues.Skip((N + 1) / 2).ToList());
}
Min = SortedValues.First();
Max = SortedValues.Last();
InterquartileRange = Q3 - Q1;
LowerFence = Q1 - 1.5 * InterquartileRange;
UpperFence = Q3 + 1.5 * InterquartileRange;
AllOutliers = SortedValues.Where(IsOutlier).ToArray();
LowerOutliers = SortedValues.Where(IsLowerOutlier).ToArray();
UpperOutliers = SortedValues.Where(IsUpperOutlier).ToArray();
}