Efficiency (statistics) facts for kids
In the comparison of statistical procedures, efficiency is a measure of an estimator's quality. This would be about the estimator of an experimental design, or of a hypothesis testing procedure. Basically, a more efficient estimator, experiment, or test needs fewer observations than a less efficient one to get a given performance.
See also
In Spanish: Eficiencia (estadística) para niños
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Efficiency (statistics) Facts for Kids. Kiddle Encyclopedia.