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Consider the following regression model: Y = B1 + B2X2 + BaXsi + B4Xai + uj Using the model above show that the maximum likelihood

Consider the following regression model: Y = B1 + B2X2 + BaXsi + B4Xai + uj Using the model above show that the maximum likelihood estimator for the variance, var (u,IXzi.Xsi. B4X4:), is biased (be sure to comment of the nature of the bias). "

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