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What is an «estimator» in statistics?

statistics
mathematics
theory
glossary
(Dmitry Fedyuk) #1

In statistics, an estimator is a rule for calculating an estimate of a given quantity based on observed data: thus the rule (the estimator), the quantity of interest (the estimand) and its result (the estimate) are distinguished.

en.wikipedia.org/wiki/Estimator

What is a «point estimator» in statistics?
What is a «point estimation» in statistics?