Hello List,

I have two questions.


1.)    How do I generate a matrix of residuals in RDA (I am using rda() in vegan)?

2.)    How can I test for spatial dependence (spatial autocorrelation) in the response matrix of a multivariate analysis (RDA in my case)?  I have read that you can look at the trace of the variogram matrix as a multivariate alternative to Moran's I, but I don't know the details of how to make this test happen using R.

Thanks for any help!

Tracy


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