An Etymological Dictionary of Astronomy and Astrophysics
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Statistics: Any quantity calculated from the sample data which is used to give information about an unknown quantity in a population. For example, the sample mean is an estimator of the population mean.

Agent noun of → estimate.

A sample statistics when the mean of the sampling distribution of that statistic can be shown to be equal to the parameter being estimated.

→ unbiased; → estimator.