Nothing
tpi.index <-
function(hr,ht1,ht2,time_l,time_u,time_step,delay)
{
u=seq(time_l,time_u,time_step)
a=abs(cor(ht1(u),ht2(u)))
b=abs(cor(hr(u-delay),ht2(u)))
c=abs(cor(ht1(u-delay),ht2(u)))
return(a+b-2*c)
}
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