Hi, 
Thank Gavin
for your answer but for your request “but why would you want to?” : to
partition the explained variance in my  linear regression. Thus, I want have the contribution of each
explanatory variable. 
Momadou

De : Gavin Simpson <gavin.simpson@ucl.ac.uk>
À : momadou sow <momadou@yahoo.fr>
Cc : "R-sig-ecology@r-project.org" <R-sig-ecology@r-project.org>
Envoyé le : Jeudi 7 Juillet 2011 23h00
Objet : Re: [R-sig-eco] Problem to use varpart

On Thu, 2011-07-07 at 06:33 +0100, momadou sow wrote:
> Hi, 
> I did a linear regression with 5 explanatory variables. Now, to see the contribution of each variable, I use varpart  from vegan library. But varpart don’t accepts my 5 explanatory variables, it accept only 4. 
> 1- How must I  do to use my 5 explanatory variables?
> 2- Is it the sum of variance fraction of each variable must be equal to 1. 
> Thanks for your help. 

varpart is for redundancy analysis - aka reduced rank regression. I
suppose one can do linear regression with RDA, but why would you want
to?

Anyway, you can't do what you want with varpart(). Look at interpretting
the linear model directly.

G

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