Ononot — In a linear model Y = X\beta + \epsilon, if the variance-cov

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Inferential Statisticshard

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In a linear model $Y = X\beta + \epsilon$ , if the variance-covariance matrix of the errors is $Var(\epsilon) = \Omega \neq \sigma^2 I$ , what is the Best Linear Unbiased Estimator (BLUE) for $\beta$ ?