
Hello,

I am posting this to R-help and Ecolog-L, in hopes that enough Ecologgers are R users and enough R-help users are ecologists. Please forgive the cross-posting.

I deleted a number of species from a canonical correspondence analysis (CCA) model after using the function goodness.cca in vegan.  In his explanation of the diagnostic tools for CCA (http://cc.oulu.fi/~jarioksa/softhelp/vegan/html/goodness.cca.html), Jari Oksanen states that "It is a common practise to use goodness statistics to remove
species from ordination plots". However, I have not been able to find references on this "common practice" in the literature. I may be using inappropriate search terms?? However, if anybody can point me towards some cite-able references/rules of thumb on this, I would very much appreciate it.

And yes, I am also aware that Jari goes on to say that deleting species isn't always a good idea. 

Thank you!

Lauren Quinn
 		 	   		  
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