Hello,
i'm using metaMDS to ordinate trait mean data of plants in different
ecosystems.
I used different calibrations but the stress differs only between 0,001
an 0,1e-19.
I have never seen such a good stress, so I wonder about possible
mistakes, but i cannot find one.
Data looks like that:
plots trait1 trait2 traits3
1 2,4 0,2 20
2 0,5 0,3 21
. . . .
300 . . .
My standard calibration is:
metaMDS(test
,distance = "euclidean" # because metric data
, k = 3 # because I have 3 traits, but I
couldn't plot a scree plot
, trymax = 3-5 # not more, because too large dataset
, autotransform =TRUE
, noshare =1 # Ordination may be very difficult if a large proportion
of sites have no shared species. In this case, the results may be
improved with stepacross dissimilarities, or flexible shortest paths
among all sites. No manipilation: noshare=1.0
,trace = TRUE # will monitor the final stresses
,plot = TRUE
,zerodist="add"
)
thanks for helping me out
Daniel
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Daniel Hornstein
University of Bayreuth, Germany
Department of Disturbance Ecology
phone: 0921//55-2173