e em seguida apliquemo-la à (10.4.8):
ΣX=σ02(ATM−1A)−1ATM−1MM−1A(ATM−1A)−1,\Sigma_X = \sigma_0^2 (A^T M^{-1} A)^{-1} A^T M^{-1} MM^{-1} A (A^T M^{-1} A)^{-1},ΣX=σ02(ATM−1A)−1ATM−1MM−1A(ATM−1A)−1,
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