Dear List,
 
I have an experiment trying to evaluate two treatment for mice. I have 3 normal strains, two treatment and two time points.
The goal is to compare t2 vs t1 Day14 vs Day0.
All these mice considered normal. So I can create factor such as day0_t1, day0_t2, day14_t1, and day14_t2.
and make contrasts, such as day0_t2-day0_t1, day14_t2-day14_t1, day14_t2-day14_t1...
 
But how can I include strain information into the comparison? Since each strain's data will be correlated? 
 
Thank you.
 
Xiaokuan
 
 
 
 
 
 
Strain Day Treatment 
B6 0 t1 
B6 14 t1 
B6 0 t2 
B6 14 t2 
Balbc 0 t1 
Balbc 14 t1 
Balbc 0 t2 
J129 0 t1 
J129 0 t2 
J129 14 t2 


      
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