The distribution and quantity of Felis lynx population in the northeast have been found out by the three-stagesampling method.
我们利用三阶抽样法，查清了东北地区猞猁种群的分布及数量情况。
2
A balanced three-layer sample rotation pattern is presented in this paper to solve the problem of rotation for the quarterly surveys with three-stagesampling designs.
本文构造了一种平衡的三层次样本轮换模式，解决了三阶段抽样季度调查的三层次样本轮换问题。
3
The paper presents a typical self-weighting sample design for the stratified three-stage or over sampling.