Dear List,
I have got error message when I run the R-code. I guess this happened when
observation(s) has no neighborhood at specified distance. Is there any
way/R-code to ignore one without neighborhood and proceed the simulation?
v.code <- df.bm7[,c(10:31)]; v.code[1:3,]
names(v.code)
CM = v.code # variable binomial code
sim.sp <- function(data,CM,n,N)
{
C <- matrix(rep(NA,N),ncol=1)
for(i in 1:N)
{
j <- n
xx <- which(colSums(CM[j,])==1)
V <- names(xx)
V <- paste(V, collapse="+")
V <- paste("SBA~", V)
rd <- round(nrow(data)*(2/3))
d <- sample(seq(1:nrow(data)),rd)
dat1 <- data[d,]
dat2 <- data[-d,]
crd <- cbind(dat1$Longitude,dat1$Latitude)
dist60 <- dnearneigh(crd,0,60,longlat=F)
dist60sw <- nb2listw(dist60, style="B")
fm <- errorsarlm(as.formula(V), data=dat1, listw=dist60sw)
pred <- predict(fm,dat2)
C[i,1] <- cor(dat2$SBA,pred)
out <- cbind(C)
}
colMeans(out)
}
sim.sp(df2007.5k.s2,CM,1,1000)
Error in nb2listw(dist60, style = "B") : Empty neighbour sets found
And, here are my partial data and addition information just in case.
> df2007.5k.s2[1:5,]
Longitude Latitude Ring stage2 SBA corn sbn w.wit
oats afl dbn vg.frt fidle grs.pstr wdlnd nlcd.ow nlcd.dec
821 419.9678 496.3359 5000 2 0.2041200 6.873500 6.515908 5.861865
5.139832 6.260552 5.087444 0.000000 4.818602 6.897949 4.927745 7.073408
7.348551
822 440.9583 533.2685 5000 2 1.1832698 6.829823 6.402711 4.098471
5.660730 6.394553 4.700505 0.000000 4.399483 6.885719 5.159137 5.779678
7.617312
823 434.2998 550.4301 5000 2 0.8419848 6.901722 6.377190 4.575569
5.571924 6.411776 4.450634 3.496515 4.537781 6.874229 5.001530 6.249959
7.497547
824 388.2020 550.3011 5000 2 0.5563025 7.116200 6.467652 3.973543
4.894322 6.279565 5.872954 5.460165 3.973543 6.985068 4.958779 6.431883
7.524418
825 365.8802 548.6984 5000 2 0.5314789 7.236186 6.739166 5.571924
5.729373 6.810875 6.049045 4.537781 3.973543 6.921747 5.335227 5.892576
7.425795
nlcd.shrb nlcd.grshrb forest o.legume devel wetland grains
ra.SDI
821 5.504978 6.599838 6.661026 4.450634 6.974943 6.640015 4.838805
25.94976
822 5.758828 5.736926 5.027859 5.064582 6.652622 7.020253 3.973543
25.62106
823 5.840769 5.937286 5.399468 4.274550 6.959373 7.125071 4.496390
27.71064
824 5.571924 6.287365 6.217362 3.496515 6.860364 6.366780 4.098471
26.62635
825 5.593287 6.247655 5.642505 3.973543 6.816315 6.278132 5.014894
28.65973
> v.code[1:5,]
Latitude Longitude corn sbn afl grs.pstr nlcd.dec nlcd.grshrb devel
wetland ra.SDI oats nlcd.shrb w.wit wdlnd nlcd.ow dbn vg.frt fidle forest
169 0 1 0 0 0 0 0 0
0 0 0 1 1 0 0 0 0 0 0 0
170 0 1 0 0 0 1 0 0
0 0 0 1 1 0 0 0 0 0 0 0
171 0 1 0 0 0 0 0 0
0 0 0 1 1 0 0 0 1 0 0 0
193 0 1 0 0 0 0 0 0
0 0 0 1 1 0 0 0 0 0 0 0
217 0 1 0 0 0 0 0 0
0 0 0 1 1 0 0 0 0 0 0 0
o.legume grains
169 0 1
170 0 1
171 1 1
193 0 0
217 0 0
Thank you in advance!!
Steve Hong
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