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polgen
2010 Jun 09
1
ordisurf (pkg vegan) gives implausible result
I'm having trouble with the ordisurf function in the vegan package.
I have created an ordination plot (cmdscale) of 60 samples based on
Bray-Curtis dissimilarities, and would like to overlay various soil edaphic
characteristics as possible clues to the clustering I observe in my plot.
However, I find that ordisurf creates a surface on the plot that is a
perfect, even gradient - and