Nothing
FV_pre_artan=function(data,years=10){
sigma2=function(x){var(x) * (length(x) - 1)/length(x)}
U=1+data
u1=mean(U)
var=sigma2(U)
u2=sqrt(var+u1^2)
u_min=1+min(data)
u_max=1+max(data)
d=(u_min+u_max)/2
a=(u_max-u_min)/pi
b=tan(x=((u2-d)/a))-tan(x=((u1-d)/a))
c=tan(x=((u1-d)/a))-b
appo=rep(NA,years)
for(i in 1:years) {appo[i]=(a*atan(x=(b*i+c))+d)^i}
final_value=sum(appo)
return(final_value)
}
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