Ratios of Standard Errors () when Sensitivity = Specificity = 0.80.

a The optimal reclassification rate for reclassification sampling.b Compared to one-phase sampling, because in these cases, one-phase sampling provides estimates with smaller standard errors then with two-phase sampling.a. 重分类抽样（reclassification sampling）的最优重分类率（optimal reclassification rate）。 b. 相较于单阶段抽样（one-phase sampling），在此类情形下，单阶段抽样所得估计值的标准误（standard error）小于两阶段抽样（two-phase sampling）得到的估计值标准误。