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I have tried to proof the variance of this estimator.

Is this right?

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Richard Hardy
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econo
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    This website supports math typesetting. Using math typesetting, instead of pasting images of Word documents, will make it easier to read your question and increase the likelihood of getting a useful answer. More information: https://math.meta.stackexchange.com/questions/5020/mathjax-basic-tutorial-and-quick-reference – Sycorax Nov 22 '22 at 18:45
  • You have to explain some notation for your post to be fully understood; e.g. what are $x_1,y_n,\ldots$. – utobi Nov 22 '22 at 19:07
  • It's not correct. The duplicates give the formula to use. BTW, there appears to be a typographical error in your expression for $\tilde \beta_1:$ the numerator likely involves only $x_1+x_n.$ – whuber Nov 22 '22 at 19:32

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