On Tue, 4 May 2010, rusers.sh wrote:
Hi there, Take the data of columbus(spdep) as an example. Say ?i? is one of the polygons, and ?j? represents its neighbours. How to get the vlues of ?sum(Wij*Xj)?? ?Wij? means the weights, which can be get by ?nb2listw$weights?. Say ?Xj? to be ?columbus$PLUMB?. The problem is how to get the right values of ?columbus$PLUMB? for the corresponding neighbours, so i can calculate the "sum(Wij*Xj)"? See the following example. example(columbus);coords <- coordinates(columbus) nbs <- dnearneigh(coords,0,4) nbslistw<-nb2listw(nbs, style="B") #nbslistw$neighbours; nbslistw$weights I can not figure it out. Anybody can give me some suggestions?
lag(nbslistw, x) ?lag.listw HTH Roger
Thanks.
-- Roger Bivand Economic Geography Section, Department of Economics, Norwegian School of Economics and Business Administration, Helleveien 30, N-5045 Bergen, Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43 e-mail: roger.biv...@nhh.no _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo
