Table 1: Efficiency comparisons between different estimators.

EstimatorMore efficient than estimatorIf

𝑦 𝑦 𝑅 𝑘 1 / 2
𝑦 𝑦 𝑃 𝑘 1 / 2
𝑦 𝑅 𝑦 𝑘 > 1 / 2
𝑦 𝑃 𝑦 𝑘 < 1 / 2
𝑦 𝑦 R e 𝑘 1 / 4
𝑦 𝑦 P e 𝑘 1 / 4
𝑦 R e 𝑦 𝑘 > 1 / 4
𝑦 P e 𝑦 𝑘 < 1 / 4
𝑦 𝑦 C R 𝑘 1
𝑦 𝑦 C P 𝑘 1
𝑦 C R 𝑦 𝑘 > 1
𝑦 C P 𝑦 𝑘 < 1
𝑦 C R 𝑦 𝑅 𝑘 > 3 / 2
𝑦 C P 𝑦 𝑃 𝑘 < 3 / 2