This indicator is a ported MQL5 indicator from http://www.mql5.com/en/code/1741.
Formulas:
CO[i] = Close[i]-Open[i],
U[i] = Coeff(MA(Abs(CO))),
D[i] = -U[i].
Download:
Dec 14, 2015: Compatibility issue Fixed. _Alert helper is not longer needed.
For this indicator must be installed Averages indicator (viewtopic.php?f=17&t=2430).