WAMI Strategy

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//  Copyright by HPotter v1.0 08/07/2014
// The WAMI-based trading lies in the application and iteration of the 
// optimization process until the indicated trades on past market data 
// give consistent, profitable results. It is rather difficult process 
// based on Fourier analysis. 
// You can to change Trigger parameter for to get best values of strategy.
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study(title="WAMI Strategy", shorttitle="WAMI Strategy")
Length_EMA = input(13, minval=1)
Length_WMA = input(4, minval=1)
Trigger = input(0)
hline(Trigger, color=purple, linestyle=line)
xWAMI = ema(ema(wma(mom(close, 1),Length_WMA),Length_EMA),Length_EMA)
pos =	iff(xWAMI > Trigger, 1,
	    iff(xWAMI < Trigger, -1, nz(pos[1], 0))) 
barcolor(pos == -1 ? red: pos == 1 ? green : blue )
plot(xWAMI, color=blue, title="WAMI")