[R-sig-eco] adonis with continuous variables

[Gavin Simpson]

On Thu, 2011-03-10 at 01:25 -0800, alfredo Tello wrote:
> Hi Jari,
> 
> Thanks for your prompt reply. That clears things up, although you've left me
> with a doubt. You said:
> 
> "Indeed, adonis() can use only continuous variables, it is documented to do
> so, and this was initially intended."  

I believe Jari meant one could fit an adoins() model using covariates
that were all of a continuous nature (i.e. a model containing only
continuous variables), not that only continuous variables were allowed
(and therefore, by definition, that categorical variables were not
allowed).

G

> Are you saying that categorical variables should not be used in adonis() as
> explanatory variables? 
> Anderson (2001) initially describes the method (although adonis might be
> implemented differently) for categorical variables if I'm not mistaken. Then
> again, the vegan documentation says that explanatory variables can be
> factors. This is what's left me a bit confused. 
> 
> Thanks in advance for clearing this up.
> 
> Cheers,
> 
> A
> 
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