A modification of the preceding model retains the mean vectors, while the covariance matrix is unrestricted but constant over units. Find an expression for the maximum-likelihood estimate of the treatment effect.

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g G 0 ER R o (i) (ii) (iii) (iv) (, o) R (v) (, ) R Aff(R) (vi) (u, o) (vii) P(R) Bic O ER R (, ) R 0 +8 0 +8 ( +8,0) (,) (+81, 0e) (go+giu, ogi) 00g-1 Pge Ber(1) Ber (10) Pe Ber(+ (0)) N(, o) (,63) N(, ) N(u, o) 0 Ber((0 + 8)) N(u +g,0) N(, oe8) N( +81, 082) N(go+81, og) 08-1