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METASTOCK: Fractal Adaptive Moving Average
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.
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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;
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KS
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