[R] Dichotomous variables

[marco]

Hi Sarah, 
sorry for the lack of details..hope now my dilemma will be clearer:
so, I have my dataset, represented by a matrix:100 subjects and 20
variables, expressed as 1(presence) and 0 (absence)
I then tried to obtain a dissimilarity m. using the jaccard() command.
To perform a NMDS, I used the isoMDS() command from the vegan package,
specifying k=2 dimensions.

The returned error sentence says that I have "0 or negative" distance
between some subjects (and that's true, a lot have an identical expression
of each variable).

adding zerodist="ignore" in isoMDS does not solve the problem: same message.

So: this is the blind alley.


thanks for any feedback

marco

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