OLS and unbiasedness

Hey! ​ I have a question about the unbiasedness of the OLS estimator. I’m aware that to be BLUE we have to expect that the E(b)=beta, meaning the expected value of our estimator equals the estimated value of our regressor – correct? I do get that, but what I dont get is when we DONT expect this to be true? Under which circumstances do expect it to be biased, and how to we know/test if it is biased and how can it be unbiased even though we have autocorrelation and/or heteroskedasticity? ​ Thank you so much! submitted by /u/darleq [link] [comments]

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Nevin Manimala

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