Nothing
dpi.index <-
function(hr1,hr2,ht,time_l,time_u,time_step,delay)
{
u=seq(time_l,time_u,time_step)
a=abs(cor(hr1(u-delay),ht(u)))
c=abs(cor(hr2(u-delay),ht(u)))
b=abs(cor(hr1(u-delay),ht(u-delay)))
d=abs(cor(hr2(u-delay),ht(u-delay)))
return(a+b-c-d)
}
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