If N1 = N2 = ... = Nt == N, show that two contrasts A~fl and A~fl

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If N1 = N2 = ... = Nt == N, show that two contrasts A~fl and A~fl are orthogonal if and only if A~ A2 = O.

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If N1 = N2 = ... = Nt == N, show that two contrasts A~fl and A~fl

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