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Reference.org
Control variates
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<p>The control variates method is a <a href="/facts/Variance_reduction/EFbuX0tD">variance reduction</a> technique used in <a href="/facts/Monte_Carlo_methods/AkHjY7jc">Monte Carlo methods</a>. It exploits information about the errors in estimates of known quantities to reduce the error of an estimate of an unknown quantity. </p>