**7.1: Estimators - Statistics LibreTexts**
https://stats.libretexts.org/Bookshelves/Probability_Theory/Probability_Mathematical_Statistics_and_Stochastic_Processes_(Siegrist)/07%3A_Point_Estimation/7.01%3A_Estimators

WebApr 23, 2022 · A real-valued statistic \(U = u(\bs{X})\) that is used to estimate \(\theta\) is called, appropriately enough, an estimator of \(\theta\). Thus, the estimator is a random variable and hence has a distribution, a mean, a variance, and so on (all of which, as noted above, will generally depend on \( \theta \)).

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