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John Ehlers’ article, “Ultimate Strength Index (USI)”, introduced his latest modification to the RSI indicator. Here is the formula to add that indicator to MetaStock.
Ultimate Strength Index (USI): Code:len:= Input("Length", 4, 150, 14);a1:= exp(-1.414*3.14159 / len);
b1:= 2*a1*Cos(1.414*180 / len);
c1:= -a1*a1;
x:= (1 + b1 - c1) / 4; SU:= if(C > Ref(C, -1), C - Ref(C, -1), 0);
avSU:= Mov(SU, 4, S);
SD:= if(C < Ref(C, -1), Ref(C, -1) - C, 0);
avSD:= Mov(SD, 4, S); {calculate ultimate smoother values of SU and SD}
USU:= if(cum(1) < 8, avSU,
(1-x)*avSU + (2*x - b1)*Ref(avSU, -1) - (x + c1)*Ref(avSU, -2) + b1*Prev + c1*Ref(Prev, -1)); USD:= if(cum(1) < 8, avSD,
(1-x)*avSD + (2*x - b1)*Ref(avSD, -1) - (x + c1)*Ref(avSD, -2) + b1*Prev + c1*Ref(Prev, -1)); denom:= if( (USU + USD <> 0), USU + USD, -1);
if(denom = -1, 0, (USU-USD) / denom)
William Golson
MetaStock Technical Support
Edited by user Monday, February 17, 2025 11:13:34 PM(UTC)
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