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<p class="MsoNormal"><font size="4"><span lang="EN-US">Dear spdep users,</span></font></p>
<p class="MsoNormal"><font size="4"><span lang="EN-US"> </span></font></p>
<p class="MsoNormal"><font size="4"><span lang="EN-US">I tried to follow below command to create a neighborhood list. The data "</span></font><font size="4">Matrix.txt" is enclosed<br></font></p>
<p class="MsoNormal"><font size="4"><span lang="EN-US"> </span></font></p><font size="4">> mat0 <- read.table("Matrix.txt", header=FALSE, sep="\t", fill=TRUE)<br>> mat <- as.matrix(mat0)<br>
> dim(mat)<br><span style="color:rgb(255,0,0)">[1] 46 46</span><br>> summary(c(mat))<br> <span style="color:rgb(255,0,0)">Min. 1st Qu. Median Mean 3rd Qu. Max. NA's </span><br style="color:rgb(255,0,0)">
<span style="color:rgb(255,0,0)"> 1 1 1 1 1 1 1918 </span><br>> mat[<a href="http://is.na" target="_blank">is.na</a>(mat)] <- 0<br>> summary(c(mat))<br><span style="color:rgb(255,0,0)"> Min. 1st Qu. Median Mean 3rd Qu. Max. </span><br style="color:rgb(255,0,0)">
<span style="color:rgb(255,0,0)">0.00000 0.00000 0.00000 0.09357 0.00000 1.00000 </span><br>> lw <- mat2listw(mat, style="B")<br><span style="color:rgb(255,0,0)">Warning message:</span><br style="color:rgb(255,0,0)">
<span style="color:rgb(255,0,0)">In nb2listw(res$neighbours, glist = res$weights, style = style, :</span><br style="color:rgb(255,0,0)"><span style="color:rgb(255,0,0)"> zero sum general weights</span><br>> summary(lw)<br>
<span style="color:rgb(255,0,0)">Characteristics of weights list object:</span><br style="color:rgb(255,0,0)"><span style="color:rgb(255,0,0)">Neighbour list object:</span><br style="color:rgb(255,0,0)"><span style="color:rgb(255,0,0)">Number of regions: 46 </span><br style="color:rgb(255,0,0)">
<span style="color:rgb(255,0,0)">Number of nonzero links: 198 </span><br style="color:rgb(255,0,0)"><span style="color:rgb(255,0,0)">Percentage nonzero weights: 9.357278 </span><br style="color:rgb(255,0,0)"><span style="color:rgb(255,0,0)">Average number of links: 4.304348 </span><br style="color:rgb(255,0,0)">
<span style="color:rgb(255,0,0)">2 regions with no links:</span><br style="color:rgb(255,0,0)"><span style="color:rgb(255,0,0)">2 18</span><br style="color:rgb(255,0,0)"><span style="color:rgb(255,0,0)">Link number distribution:</span><br style="color:rgb(255,0,0)">
<br style="color:rgb(255,0,0)"><span style="color:rgb(255,0,0)"> 0 2 3 4 5 6 7 8 </span><br style="color:rgb(255,0,0)"><span style="color:rgb(255,0,0)"> 2 5 5 14 8 9 1 2 </span><br style="color:rgb(255,0,0)">
<span style="color:rgb(255,0,0)">5 least connected regions:</span><br style="color:rgb(255,0,0)"><span style="color:rgb(255,0,0)">7 8 9 36 41 with 2 links</span><br style="color:rgb(255,0,0)"><span style="color:rgb(255,0,0)">2 most connected regions:</span><br style="color:rgb(255,0,0)">
<span style="color:rgb(255,0,0)">24 38 with 8 links</span><br style="color:rgb(255,0,0)"><br style="color:rgb(255,0,0)"><span style="color:rgb(255,0,0)">Weights style: B </span><br style="color:rgb(255,0,0)"><span style="color:rgb(255,0,0)">Weights constants summary:</span><br style="color:rgb(255,0,0)">
<span style="color:rgb(255,0,0)">Error in print(data.frame(rbind(unlist(spweights.constants(object, zero.policy = zero.policy))[c(1, : </span><br style="color:rgb(255,0,0)"><span style="color:rgb(255,0,0)"> error in evaluating the argument 'x' in selecting a method for function 'print': Error in spweights.constants(object, zero.policy = zero.policy) : </span><br style="color:rgb(255,0,0)">
<span style="color:rgb(255,0,0)"> regions with no neighbours found</span><br>> is.symmetric.nb(lw$neighbours)<br><span style="color:rgb(255,0,0)">[1] TRUE</span><br><br></font><p class="MsoNormal" style="text-indent:11.25pt">
<font size="4"><span lang="EN-US"> </span></font></p>
<p class="MsoNormal"><font size="4"><span lang="EN-US">The neighborhood list cannot be used in
spatial regression. The main error seems to be "</span></font><font style="color:rgb(51,102,255)" size="4">Error in print(data.frame(rbind(unlist(spweights.constants(object, zero.policy = zero.policy))[c(1, : <br>
error in evaluating the
argument 'x' in selecting a method for function 'print': Error in
spweights.constants(object, zero.policy = zero.policy) : <br>
regions with no neighbours found"</font></p><p class="MsoNormal"><br><font size="4"><span style="color:rgb(255,0,0)"></span></font></p><p class="MsoNormal"><font size="4"><span style="color:rgb(255,0,0)"></span></font><font size="4"><span lang="EN-US"> Is there anyone know what wrong with the data? I have tried to add "zero.policy=true". Thanks<br>
</span></font></p>
<p class="MsoNormal"><font size="4"><span lang="EN-US"> </span></font></p>
<p class="MsoNormal"><font size="4"><span lang="EN-US"> </span></font></p>
<span lang="EN-US"><font size="4">Happy Easter<br><br></font><br></span>
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