{ Downloaded From https://www.WiseStockTrader.com }
tp:=Input("Time Periods",1,200,21);

((tp*(Sum(Cum(1)*C,tp)))-(Sum(Cum(1),tp)*(Sum(C,tp))))/((tp*Sum(Pwr(Cum(1),2),tp))-Pwr(Sum(Cum(1),tp),2))