[BioC] A doubt with contrasts in limma

[Cittaro Davide]

On 11/ago/2012, at 18:33, "James W. MacDonald" <jmacdon at uw.edu> wrote:
 Instead you should divide 
> each group by two, e.g.:
> 
> (A.C + A.D)/2 - (B.C + B.D)/2 for genotypes

Great, thanks!

d



> 
> Best,
> 
> Jim
> 
> 
> 
>> (A.C - A.D) - (B.C - B-D) for interactions (as in the manual)
>> 
>> ?
>> 
>> d
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> -- 
> James W. MacDonald, M.S.
> Biostatistician
> University of Washington
> Environmental and Occupational Health Sciences
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