In the original publication of Chou (2000), The equation of d-th rank sequence order coupling number is defined as: <a href="https://www.codecogs.com/eqnedit.php?latex=\tau_d&space;=&space;\frac{1}{(N-d)}&space;\sum_{i=1}^{N-d}&space;(d_{i,&space;i+d})^2,&space;d=&space;1,2,&space;...,&space;maxlag" target="_blank"><img src="https://latex.codecogs.com/gif.latex?\tau_d&space;=&space;\frac{1}{(N-d)}&space;\sum_{i=1}^{N-d}&space;(d_{i,&space;i+d})^2,&space;d=&space;1,2,&space;...,&space;maxlag" title="\tau_d = \frac{1}{(N-d)} \sum_{i=1}^{N-d} (d_{i, i+d})^2, d= 1,2, ..., maxlag" /></a> In your implementation and vignette, the sequence-order-coupling number is given without <a href="https://www.codecogs.com/eqnedit.php?latex=\frac{1}{(N-d)}" target="_blank"><img src="https://latex.codecogs.com/gif.latex?\frac{1}{(N-d)}" title="\frac{1}{(N-d)}" /></a> term. I wonder why you changed mean to sum.
In the original publication of Chou (2000), The equation of d-th rank sequence order coupling number is defined as:
In your implementation and vignette, the sequence-order-coupling number is given without
term. I wonder why you changed mean to sum.