In chapter 4, introducing the application of calibration estimator in two-phase sampling, non-response and sampling rotation.
第四章，从横向上介绍了校准估计量在二重抽样中的应用、在无回答中的应用，并推出其在样本轮换中的应用。
Firstly, the Gauss map of points on the cylinder and a random sampling method are used to compute the rotation axis equation of the simple articulator.
首先通过构造圆柱面上点的高斯图和任意采样的方法，计算出简单牙合架转动轴线方程。
The present balanced two-layer sample rotation system is applicable only to the monthly survey with two-stage sample designs and with small primary sampling units.
目前的平衡两层次样本轮换模式只适用于一级单元规模较小时的两阶段抽样月度调查。
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