Relative Efficiency
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The relative efficiency of two procedures is the ratio of their efficiencies, although often this term is used where the comparison is made between a given procedure and a notional best possible procedure. The efficiencies and the relative efficiency of two procedures theoretically depend on the sample size available for the given procedure, but it is often possible to use the asymptotic relative efficiency (defined as the limit of the relative efficiencies as the sample size grows) as the principal comparison measure. Efficiencies are often defined using the variance or mean square error as the measure of desirability.For experimental designs, efficiency relates to the ability of a design to achieve the objective of the study with minimal expenditure of resources such as time and money. In simple cases, the relative efficiency of designs can be expressed as the ratio of the sample sizes required to achieve a given objective.
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