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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