
Hello,

I posted this R-help and Ecolog-L before I knew about R-sig-ecology.
I hope you will forgive the cross-posting, if you subscribe to those lists too.

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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