[R-sig-eco] Why removing the singletons in beta-diversity analysis?

[zkzlzx]

Hi, all 
Do you remove the singletons in beta-diversity analysis? 
If so, why?  
One guess is  the singletons *provides no information *about beta-diversity?
--- I donot think so, I believe they do provide information, although just a
little.
 Another guess is the existence of singletons* harms the analysis*, e.g. it
violates the assumption of the model.
 --- If so, to remove the singletons or not just depends. 

Similar problem lies in the high-prevelance variables. I used to remove both
the singletons and high-prevelance ones in beta-diversity analysis.
 
Thanks 

Kai 



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