[Proof] MSE = Variance + Bias²

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Proof that the mean squared error of an estimator is equal to the variance plus bias squared.

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The first explanation I found that takes the time to expand Bias^2. Thank you!

matheusmaldaner
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Thank you so much! I spent too much time trying to figure this out and this was so clear.

sammymendis
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You're doing a great job, thank you.

HaykTarkhanyan
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2:23 why not distributing expected value E to theta^2???

sophia
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if we are given a pdf of 4 values of x with their probabilities in terms of theta, then we find an estimator for the mean theta-hat and then we find the mean square error in terms of theta (should it be in terms of theta?), how can we find if it it mean square consistent. I am unsure because n=4 for my questions so I can't see how it makes sense to consider the limit as n goes to infinity. Please could someone shed some light. Thank you

swaggy