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John Ehler's article, “RocketRSI – A Solid Propellant For Your Rocket Science Trading”, presented two variations on the standard RSI calculation. Below are the MetaStock formulas for these indicators:
MYRSI:Code:sml:= 8; {smooth length}
rsil:= 10; {RSI length}{super smoother}
a1:= Exp(-1.414 * 3.14159 / sml);
b1:= 2*a1 * Cos(1.414*180 / sml);
c2:= b1;
c3:= -a1 * a1;
c1:= 1 - c2 - c3;
filt:= c1 * (C + Ref(C, -1))/2 + c2*PREV + c3*Ref(PREV,-1); {RSI}
change:= ROC(filt, 1, $);
CU:= Sum(If(change > 0, change, 0), rsil);
CD:= Sum(If(change < 0, Abs(change), 0), rsil);
denom:= If(CU+CD = 0, -1, CU+CD);
If(denom=-1, 0, (CU-CD)/denom)
RocketRSI:Code:sml:= 8; {smooth length}
rsil:= 10; {RSI length}{super smoother}
a1:= Exp(-1.414 * 3.14159 / sml);
b1:= 2*a1 * Cos(1.414*180 / sml);
c2:= b1;
c3:= -a1 * a1;
c1:= 1 - c2 - c3;
rmom:= C-Ref(C, -(rsil-1));
filt:= c1 * (rmom + Ref(rmom, -1))/2 + c2*PREV + c3*Ref(PREV,-1); {RSI}
change:= ROC(filt, 1, $);
CU:= Sum(If(change > 0, change, 0), rsil);
CD:= Sum(If(change < 0, Abs(change), 0), rsil);
denom:= If(CU+CD = 0, -1, CU+CD);
myRSI:= If(denom=-1, 50, (CU-CD)/denom);
limit:= If(myRSI>0.999, 0.999, If(myRSI<-0.999, -0.999, myRSI));
.5*Log((1+limit) / (1-limit))
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