= Efficiency
{disambiguate=statistics}
{wiki}
= Statistical efficiency
{synonym}
Statistical efficiency compares the precision of procedures estimating the same <estimand>. For unbiased <estimators>, relative efficiency is commonly a ratio of their <variances>; lower variance means more information from the same sample size. An <efficient estimator> attains a relevant information lower bound. A baseline-adjusted <linear regression> can improve precision in a <randomized controlled trial> by removing prognostic variation.
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