Multivariate spatial autocorrelation test (in C)
This function performs a multivariate autocorrelation test.
multispati.randtest(dudi, listw, nrepet = 999, ...)
dudi |
an object of class |
listw |
an object of class |
nrepet |
the number of permutations |
... |
further arguments passed to or from other methods |
We note X the data frame with the variables, Q the column weights matrix and D the row weights matrix associated to the duality diagram dudi. We note L the neighbouring weights matrix associated to listw. This function performs a Monte-Carlo Test on the multivariate spatial autocorrelation index :
r = trace(t(X)DLXQ) / trace(t(X)DXQ)
Returns an object of class randtest (randomization tests).
Daniel Chessel
Sébastien Ollier sebastien.ollier@u-psud.fr
Smouse, P. E. and Peakall, R. (1999) Spatial autocorrelation analysis of individual multiallele and multilocus genetic structure. Heredity, 82, 561–573.
if (requireNamespace("spdep", quietly = TRUE)) {
data(mafragh)
maf.listw <- spdep::nb2listw(neig2nb(mafragh$neig))
maf.pca <- dudi.pca(mafragh$env, scannf = FALSE)
multispati.randtest(maf.pca, maf.listw)
maf.pca.ms <- multispati(maf.pca, maf.listw, scannf = FALSE)
plot(maf.pca.ms)
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