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2007 Sep 20
1
Non-metric multidimensional scaling
...unning 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$points, type = "n")
text(Gquad.mds$points, labels = as.character(Gquads$Quadname), cex = .5)
The data.frame includes 711 records, and the first 3 columns contain
categorical variables which I exclude from the analysis.
When I invoke the script above an error message is returned.
Error in isoMDS(Gquad.dist) : zero or negative distance between objects
179 and 180....