There are lots of CCI versions out there. Here are two.


{CCI according to Steve Achelis' TA from A to Zbook, of which an electronic version can be found https://www.metastock.com/free/taaz/cci.html}
step1:=(H+L+C)/3;
step2:=Mov(step1,14,S);
step3:=Ref(step1,-1)-step2 AND
Ref(step1,-2)-step2 AND
Ref(step1,-3)-step2 AND
Ref(step1,-4)-step2 AND
Ref(step1,-5)-step2 AND
Ref(step1,-6)-step2 AND
Ref(step1,-7)-step2 AND
Ref(step1,-8)-step2 AND
Ref(step1,-9)-step2 AND
Ref(step1,-10)-step2 AND
Ref(step1,-11)-step2 AND
Ref(step1,-12)-step2 AND
Ref(step1,-13)-step2 AND
Ref(step1,-14)-step2;
step4:=Mov(Abs(step3),14,S);
step5:=step4*0.015;
step6:=step1-step2;
step7:=step6/step5;
step8:=step7/20;{for the +100, -100 scale}
step8

and

{CCI-STD cs}
{written by Corey Saxe}
V1:=Input("Periods",2,250,14);
x:=Typical();
y:=Mov(x,V1,S);
z:=Sum(Abs(x-LastValue(y+PREV-PREV)),V1)/V1;
A1:=z*0.015;
ZZI:=(x-y)/A1;
ZZI{end}