[R-sig-Geo] poly2nb neighbour itself should be considered a neighbour

[Dexter Locke]

Dear Robert,

It sounds like what you are looking for is typically called a second order neighbor. Higher order neighbors can also included in a weights matrix such as your neighbors’, neighbors’, neighbor which is a third-order neighbor. I think you are seeking second-order neighbors. 

See the spdep vignettes, and the section 5 Higher-Order Neighbors subsection here: https://cran.r-project.org/web/packages/spdep/vignettes/nb.pdf in particular. The spdep::nblag might be what you need, but without additional information it is hard to know. 

Good luck,
Dexter
dexterlocke.com



> On Nov 3, 2019, at 2:12 PM, Robert R <usercatch using outlook.com> wrote:
> 
> Dear All,
> 
> I would like to know if the function "poly2nb" ("spdep" package.) let me create a neighborhood of itself, i.e., not only its queen neighbors (queen=TRUE), but a neighbour itself should also be considered a neighbour.
> 
> I am looking to create a queen weight neighborhood matrix afterwards using "nb2listw".
> 
> Any help would help me a lot.
> 
> Many thanks
> 
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