How to create a "nb" object?

Hi group,

I'd like to do spatial analysis of my data using the spdep package. It
appears that a file of class nb is necessary, but I do not find what
that should look like and if there is a function that creates such file
for me.

If you have points that represent your data observations, you can use
triangulation-based functions like: tri2nb, gabrielneigh, relativeneigh,
soi.graph, graph2nb; distance-based neighbours from dnearneigh; k-nearest
neighbours from knn2nb and knearneigh. If you have polygons, you can find
contiguous polygons with poly2nb;  and cell2nb will give you an nb object
for a regular grid.

Which you choose will depend on your research problem and how your data 
are structured. Some can generate observations with no neighbours 
(especially the distance-based schemes). You can also export neighbour 
lists in "GAL" format from programs like GeoDa for use in spdep in R.

Roger

How can I create a nb-object of my data points?

Thanks,

Ren? Eschen.


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