correlation coefficient spatially lagged scatterplot

Dear list!

I found a 7 year old message with a question very similar to mine:

"I am using 'sgeostat' package by Albrecht Gebhardt and I am trying to
put a
correlation coefficient of some kind on the lagplots. Is there a possiblity
to do so?"

and i did not find an answer to this question. It would also be a great 
help if anybody knows how to calculate the correlation coefficents 
from this lagged scatterplot (maybe from the point and pair object 
used for the plot?)

Thanks in advance.

best regards

Florian