Plural of estimator; people who make estimates or calculate approximate values, or statistical formulas used to estimate parameters from data.
From estimate + -or (agent noun suffix meaning 'one who'). In statistics, 'estimator' specifically means a function or rule for deriving estimates from observed data.
In statistics, an estimator's job is to be unbiased and efficient—imagine a archer whose arrows cluster around the bullseye (unbiased) without spreading too wide (efficient), that's the ideal estimator.
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