public static float Variance(IEnumerable <float> values, Grouptype type)
{
var avg = values.Average();
var sse = values.Sum(f => Math.Pow(f - avg, 2));
var avgSse = sse / (values.Count() - (type == Grouptype.Population ? 0 : 1));
return((float)avgSse);
}
public static float StdDeviation(IEnumerable <float> values, Grouptype type)
{
var stdDev = Math.Sqrt(Variance(values, type));
return((float)stdDev);
}