Hello, I'm new to R and to Spatial Analysis and got a problem trying to create a Spatial Weights Matrix.
*I us the following code to create the Neighbourslist:* >library(maptools) >library(spdep) >library(rgdal) >location_County<- readShapePoly("....") >proj4string(location_County)<- CRS("+proj=longlat ellps=WGS84") >location_nbq<- poly2nb(location_County) >summary(location_nbq) *And get this Output:* Neighbour list object: Number of regions: 3109 Number of nonzero links: 18246 Percentage nonzero weights: 0.1887671 Average number of links: 5.868768 4 regions with no links: 35 689 709 881 Link number distribution: 0 1 2 3 4 5 6 7 8 9 10 11 13 14 4 29 40 94 283 616 1045 703 228 51 12 2 1 1 29 least connected regions: 45 49 587 645 844 853 1206 1286 1391 1416 1456 1478 1485 1545 1546 1548 1558 1612 1621 1663 1672 1675 1760 1794 1795 2924 2925 2952 3107 with 1 link 1 most connected region: 1385 with 14 links *As there are some regions without neighbours in my data I use the following code to create the Weights Matrix:* > W_Matrix<- nb2listw(location_nbq, style="W", zero.policy=TRUE) >W_Matrix *And get this Output:* Fehler in print.listw(list(style = "W", neighbours = list(c(23L, 31L, 42L : regions with no neighbours found, use zero.policy=TRUE /("Error in print.listw(list(style = "W", neighbours = list(c(23L, 31L, 42L : regions with no neighbours found, use zero.policy=TRUE")/ As I use "zero.policy=TRUE" I just don't understand what I'm doing wrong... My question would be: How could I create a Weights Matrix allowing for no-neighbour areas? Thanks Michael -- View this message in context: http://r.789695.n4.nabble.com/Spatial-Ananlysis-zero-policy-TRUE-doesn-t-work-for-no-neighbour-regions-tp4664367.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.