[R-sig-Geo] distribution of distance for lags (spdep package)
Horacio
horacio at unm.edu
Tue Oct 3 23:52:42 CEST 2006
Dear R-geo people,
I just discovered the beauty of the spdep package to make spatial
analysis of point data easier... However, as I am climbing the learning
curve I have a question regarding the estimation of the the lag in the
Moran and/or corelogram function.
As I understand, if the you generate a neighbor-list using the
knearneigh
<http://finzi.psych.upenn.edu/R/library/spdep/html/knearneigh.html>
function you get a 'knn' class of the points I k distance apart. Then
when you calculate the Moran's I (at least that's what I did) you get
the Lag in terms of the number of links which in practical purposes is
k. so, the first correlation value (od Moran's I) is the obtained by
comaring all the sites that have a direct link between them, then, the
second lag does it in terms of the ones that are 2 links apart and so on...
My question is perhaps very simple... How can I generate a list to plot
the distribution of distances for each lag? I thought nbdists could do
it, but are not sure how to go about it...
thank you
Horacio
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