The coefficient optimization for the multistage sampling rate conversion is also presented.
还给出了多级实现的系数优化算法。
Methods A total of 550 students in 4 junior schools were sampled with multistage sampling and surveyed.
方法通过多级随机抽样抽取济南市4所初中550名初一学生，采用问卷调查。
In large scale field surveys, multistage sampling is applied because the situations are complex and there are many influencing factors.
大规模现场调查，由于情况复杂、影响因素多，往往采用多阶段混合型随机抽样方法。
Methods With cluster multistage sampling, 3 221 college students from 5 universities in Jiangsu Province were interviewed by use of questionnaire.
方法选择江苏省5所大学，采用整群抽样的方法，抽取3 221名在校本科生进行问卷调查。
Methods Cluster, stratified and multistage sampling was taken. 1261 residents over 40 years old were assigned to fill in the questionnaires designed by WHO.
方法采用多阶段随机分层抽样方法，对1261名40岁以上居民进行问卷调查。
Methods Cluster, stratified and multistage sampling was taken. 1261 residents over 40 years old were assigned to fill in the questionnaires designed by WHO.
方法采用多阶段随机分层抽样方法，对1261名40岁以上居民进行问卷调查。
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