Dear list members,
i need a hint - i am stuck on my search for a function.
I would like to calculate cross-correlograms between two variables
(predator and prey densities) and use this as an index of spatial overlap.
I used the spdep pakcage and use e.g.
sp.correlogram(xy.data.nb, prey, order = 5 , method = "I",
zero.policy=TRUE, style = "W")
sp.correlogram(xy.data.nb, predator, order = 5 , method = "I",
zero.policy=TRUE, style = "W")
to calculate the (auto-) correlograms for predator and prey individually.
But how do i combine them to calculate the cross-correlogram ?
Any hint would be highly appreciated...
Best wishes !
jens
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