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2007 Nov 21
1
problem with nb2listw
Hi,
I am a new student to R and I was hoping someone could help me with
the error message I keep getting when I try to use the nb2listw()
function.
I have 45 sites and I want to get an autocorrelation value for sites
within 1000m of each other.
coords<-cbind(EAST,NORTH)
coords<-as.matrix(coords)
nb1000<-dnearneigh(coords,0,1000,longlat=TRUE)
then when I try to run the
2007 Oct 26
1
Help needed on calculation of Moran's I
Hi,
I am trying to calculate Moran's I test for the residuals for a
regression equation, but I have trouble converting my coordinates into
nb format.
I have used the dnearneigh() funtion now with an arbitrarily high upper
distance to make it include all plots. However, when I do the
lm.morantest() I get a Moran's I value which is the same as the expected
value and a P-value of 1.
I
2007 Oct 22
3
Spatial autocorrelation
Hi,
I have collected data on trees from 5 forest plots located within the
same landscape. Data within the plots are spatially autocorrelated
(calculated using Moran's I). I would like to do a ANCOVA type of
analysis combining these five plots, but the assumption that there is no
autocorrelation in the residuals is obviously violated. Does anyone have
any ideas how to incorporate these spatial