Using the model Y = Xβ + U, and the extended least squares assumptions, derive the OLS estimator $\hat {\beta}$ Discuss the conditions under which $X ^ { \prime }$ X is invertible.

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The Answer of Using the model Y = Xβ + U, and the extended least squares assumptions, derive the OLS estimator $\hat {\beta}$ Discuss the conditions under which $X ^ { \prime }$ X is invertible.

Using the Model Y = Xβ + U, and the Extended