Dear SPMers,
 
I'd like to know wih spm the comparison between (Aa1... Aan, Ab1...Abn) and (C1...Cn) with the contraste (1, -1) is the same as the comparison of (Aa1...Aan) and (Ab1...Abn) and (C1...Cn) with the contraste (1 1 -2) ? Is there some problem of weight ?
 
Thank you very much !
 
Tao JIANG