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Hah, that's a good rebuttal. Well it would be an excellent estimator if it was unbiased (or at least had very little bias). But if f is an estimator for the true average of a function F where E[F] = 100 (for example), it's very clearly not unbiased.

It is a bit tongue in cheek.




> It is a bit tongue in cheek.

As was my reply ;)




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