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. 
 
Momadou 
PhD candidate  
Université Cheikh Anta Diop de Dakar 
Sénégal .   
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