This function takes a sites (rows) x species(columns) matrix, uses the package 'vegan' to perform distance calculations and non-metric dimensional scaling analysis, and returns a stress plot showing how well your data fit the analysis. Should be used with 'givemeNMDS' to confirm that your data is appropriate. May return a warning that says stress is nearly zero – this is usually occurs with datasets that have lots of 0 values, which is typically expected in large community datasets.
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