{ Downloaded From https://www.WiseStockTrader.com }
PSum := Ref(Sum(Typ(),19),-1);

MA := (PSum+High)/20;
SOS :=
Power(Ref(Typ(),-19)-MA,2) +
Power(Ref(Typ(),-18)-MA,2) +
Power(Ref(Typ(),-17)-MA,2) +
Power(Ref(Typ(),-16)-MA,2) +
Power(Ref(Typ(),-15)-MA,2) +
Power(Ref(Typ(),-14)-MA,2) +
Power(Ref(Typ(),-13)-MA,2) +
Power(Ref(Typ(),-12)-MA,2) +
Power(Ref(Typ(),-11)-MA,2) +
Power(Ref(Typ(),-10)-MA,2) +
Power(Ref(Typ(),-9)-MA,2) +
Power(Ref(Typ(),-8)-MA,2) +
Power(Ref(Typ(),-7)-MA,2) +
Power(Ref(Typ(),-6)-MA,2) +
Power(Ref(Typ(),-5)-MA,2) +
Power(Ref(Typ(),-4)-MA,2) +
Power(Ref(Typ(),-3)-MA,2) +
Power(Ref(Typ(),-2)-MA,2) +
Power(Ref(Typ(),-1)-MA,2) +
Power(High-MA,2);
HiSD := Sqrt(SOS/20);

MA := (PSum+Low)/20;
SOS :=
Power(Ref(Typ(),-19)-MA,2) +
Power(Ref(Typ(),-18)-MA,2) +
Power(Ref(Typ(),-17)-MA,2) +
Power(Ref(Typ(),-16)-MA,2) +
Power(Ref(Typ(),-15)-MA,2) +
Power(Ref(Typ(),-14)-MA,2) +
Power(Ref(Typ(),-13)-MA,2) +
Power(Ref(Typ(),-12)-MA,2) +
Power(Ref(Typ(),-11)-MA,2) +
Power(Ref(Typ(),-10)-MA,2) +
Power(Ref(Typ(),-9)-MA,2) +
Power(Ref(Typ(),-8)-MA,2) +
Power(Ref(Typ(),-7)-MA,2) +
Power(Ref(Typ(),-6)-MA,2) +
Power(Ref(Typ(),-5)-MA,2) +
Power(Ref(Typ(),-4)-MA,2) +
Power(Ref(Typ(),-3)-MA,2) +
Power(Ref(Typ(),-2)-MA,2) +
Power(Ref(Typ(),-1)-MA,2) +
Power(Low-MA,2);
LoSD := Sqrt(SOS/20);

MA := (Psum+(O+H+L)/3)/20;

MA + HiSD*2;
MA;
MA - LoSD*2