Hi all,
sory f it is too simple....
I am new on using R and have not been able to find the answer of my problem in 
the help archives. I am performing a relatively simple aov

aov( var ~ block + block/plot/treatment + season:bloc....) it's a bit longer 
but this is how it looks like.

my var is "lipid content", "starch content",...in wood samples. Now I want to 
add the size of the tree from where the sample was taken as a covariable, 
because I think it could have something to do.
How can I declare it ?

Thanks in advance

Bernat 

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