On Thu, 5 Apr 2018, Yalemzewod Gelaw wrote:
I am a new student to R learning for spatial analysis. I was hoping someone
could help me with the
error message I keep getting when I try to convert the neighbour data to a
listw object use the nb2listw() function.
plot(xw_nbq, coords,add=TRUE,col="red")> summary(xw_nbq)
Neighbour list object:
Number of regions: 140
Number of nonzero links: 680
Percentage nonzero weights: 3.469388
Average number of links: 4.857143
2 regions with no links:
3 138
Link number distribution:
0 1 2 3 4 5 6 7 8 9
2 6 4 16 32 35 17 13 13 2
6 least connected regions:
11 32 57 117 124 137 with 1 link
2 most connected regions:
28 71 with 9 links
when I try to run nb2listw, i got repated error following the below error
message.
xlist <- nb2listw(neighbours,glist = NULL,style = "W",zero.policy
=TRU) > summary.listw(xlist)
Error in summary.listw(xlist) : regions with no neighbours found, use
zero.policy=TRUE
Please do not send HTML-formatted messages.
You need to continue using zero.policy=TRUE when using an object created
with no-neighbour observations. You can also set a pre-session global
option using set.ZeroPolicyOption(TRUE), which is checked first in
functions using the zero.policy= argument. set.ZeroPolicyOption(TRUE)
outputs the value of get.ZeroPolicyOption() before making the change.
You should always find out why you have no-neighbour observations. From
your attached image, it looks as though you have a faulty set of polygons,
and have used poly2nb() to find border contiguities. My guess is that the
polygons with no neighbours have borders that almost touch - look at the
snap= argument in poly2nb(). There are also other near-contiguities to be
found - had the input boundaries been line-generalized?
Roger
I wonder if someone advises me how to fix the error message from my working
directory
*Regards, *
Yalem
--
Roger Bivand
Department of Economics, Norwegian School of Economics,
Helleveien 30, N-5045 Bergen, Norway.
voice: +47 55 95 93 55; e-mail: [email protected]
http://orcid.org/0000-0003-2392-6140
https://scholar.google.no/citations?user=AWeghB0AAAAJ&hl=en
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