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Moving Average - Fractal Adaptive (FAMA)
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| Added: July 19, 2007 |
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| Tags:
MetaStock, indicator
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John Ehlers' article in this issue, "Fractal Adaptive Moving Averages,"
introduces an indicator of the same name. In his indicator formula, he restricts
the number of periods to an even number. The formula in MetaStock avoids this
restriction by asking for the smaller time frame. This number is then used for
the two half-interval calculations and is then doubled for the full interval calculation.
The formula for this indicator and the steps to include it in MetaStock are presented
here. To enter this indicator into MetaStock:
In the Tools menu, select Indicator Builder.
Click New to open the Indicator Editor for a new indicator.
Type the name of the formula.
Click in the larger window and input the following formula:
Code:
Moving Average - Fractal Adaptive (FAMA)
y:=Input("sample time periods",1,20,8);
y2:=2*y;
n1:=(HHV(H,y)-LLV(L,y))/y;
n2:=Ref((HHV(H,y)-LLV(L,y))/y,-y);
n3:=(HHV(H,y2)-LLV(L,y2))/y2;
x:=(Log(n1+n2)-Log(n3))/Log(2);
xt:=Exp(-4.6*(x-1));
x1:=If(xt<0.1,0.1,If(xt>1,1,xt));
x2:=1-x1;
x3:=If(Cum(1)=y2,
(MP() * x1) + (Ref(MP(),-1) * x2),
(MP() * x1) + (PREV * x2));
x3;
Author: John Ehlers
Source: http://www.traders.com
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