当样本量较大时，QIF方法表明工作相关阵的选择等价于无偏估计方程的选择。
When the sample size is great, QIF approach shows that the selection of working correlation is same to the selection of unbiased estimating equation.
讨论多阶段抽样比率估计及其样本量选择的问题，给出了比率估计抽样均方误差的近似公式及其渐近无偏估计的公式。
We give the approximation formulas of the variance of the sample ratio estimator for a population mean and its asymptotically non-biased estimator in multi-stage sampling.
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