Hello,
I would like to perform an NMDS on the following:
I have two independent variables, which are sites and treatments.
I have 6 sites which are peatlands. I collected 5 replicates (at the same time)
from each of the sites.
I used each of the replicates in a treatment.
There were 4 treatmen
On Tue, 2010-01-12 at 10:28 -0800, kellys17 wrote:
> Hi,
>
> I am currently working on some data and feel that NMDS would return an
> excellent result. With my current data set however I have been experiencing
> some problems and cannot carry out metaMDS. I have tried with a few smaller
> data se
Hi,
I am currently working on some data and feel that NMDS would return an
excellent result. With my current data set however I have been experiencing
some problems and cannot carry out metaMDS. I have tried with a few smaller
data sets which I created for practice sake and this has worked fine.
>Error in isoMDS(Gquad.dist) : zero or negative distance between objects
>179 and 180.
>How can I handle this, is it valid to add 0.5 to every element in the
>distance matrix or is someother alternative more appropriate?
This means that your objects 179 and 180 are identical so just remove one
Hello everyone,
I'm working with R 2.4.1 on a PC running with XP.
Trying to run isoMDS as follows:
Gquad.mat <- Gquads[4:10] # extracts only the metric data variables
Gquad.dist <- dist(Gquad.mat)
Gquad.mds <- isoMDS(Gquad.dist)
plot(Gquad.mds$points, type = "n")
text(Gquad.mds$p
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