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。
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.
首先为克服由于样本数量不平衡性引起的小样本类别精度差的问题，引入由于样本差异的权重；
In order to improve the class accuracy of small number of samples caused by the imbalance of sample number, weight of sample difference is introduced.
根据样品的重量，这个系统在1至3分钟内将样本置于平衡状态。
Depending on the weight of the sample, this system will bring samples to equilibrium within 1 to 3 minutes.
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