[R-sig-eco] Ordination with vegan's metaMDS
Michele Tobias
mmtobias at ucdavis.edu
Fri Apr 3 08:49:11 CEST 2009
I have plant cover data for a number of sample plots and would like to
do an ordination plot with the vegan package's metaMDS. The problem is
that some of my plots have matching data (for example, two plots have 5%
cover by one species and nothing else). Because of this, the
dissimilarity measure between these is zero and the ordination doesn't
work. It gives me this message: "Error in metaMDSdist(comm, distance =
distance, autotransform = autotransform, : Zero dissimilarities are not
allowed".
Does anyone have any suggestions on how to work with this? Thank you
for your help!
cheers,
Michele
--
Michele Tobias
PhD Student
Geography Graduate Group
University of California, Davis
tobias.michele at gmail.com
mmtobias at ucdavis.edu
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