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Competitive Stats
Q119Section III (Statistics)119 of 145

The ratio estimator wins when ρ>12 CV(x)/CV(y)\rho>\frac12\,\mathrm{CV}(x)/\mathrm{CV}(y)

The ratio estimator yˉ^R\hat{\bar y}_R is more precise than the mean per unit estimator yˉ\bar y if:

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