Question: (Singular Variance) Suppose that the variance matrix $Omega_0$ is singular. Show that the GLS estimator is provided that $X'Omega_0^{-1}X$ is nonsingular. (XX) X' y=argmin(y-X) (y-XB)

(Singular Variance) Suppose that the variance matrix $\Omega_0$ is singular. Show that the GLS estimator is

(XX) X' y=argmin(y-X) (y-XB) B

provided that $X'\Omega_0^{-1}X$ is nonsingular.

(XX) X' y=argmin(y-X) (y-XB) B

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