[R-sig-eco] using metaMDS and getting error messages

Aisyah aisyah.faruk at ioz.ac.uk
Tue Feb 2 14:25:48 CET 2010


Hi

Im currently trying to use the metaMDS function on MASS and keep getting
this message. Im new at this and need some help. 

>stream.mds<-metaMDS(stream)
Using step-across dissimilarities:
Too long or NA distances: 65 out of 105 (61.9%)
Stepping across 105 dissimilarities...
Error in isoMDS(dist, k = k, trace = isotrace) : 
  an initial configuration must be supplied with NA/Infs in 'd'
In addition: Warning messages:
1: In stepacross(dis, trace = trace, ...) :
  Disconnected data: Result will contain NAs
2: In metaMDSdist(comm, distance = distance, autotransform = autotransform, 
:
  Data are disconnected, results may be meaningless

The data is abundance of different species in certain plots. I've
standardized the data using the wisconsin function.

Thanks

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