protected override decimal Calculate(int index)
{
int startIndex = Math.Max(0, index - _timeFrame + 1);
decimal numberOfObservations = index - startIndex + 1;
return(_sdev.GetValue(index).DividedBy(numberOfObservations.Sqrt()));
}
protected override decimal Calculate(int index)
{
// z-score = (ref - mean) / sd
return((_indicator.GetValue(index).Minus(_mean.GetValue(index))).DividedBy(_sd.GetValue(index)));
}