Methods a questionnaire was conducted among target population by multistage sampling.
方法采取多阶段抽样，对目标人群进行询问式问卷调查。
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。
Methods Multistage sampling and stratified sampling were used and information was gathered by interview with questionnaires.
方法采用分层多阶段随机抽样法，获取样本。并采取问卷的形式进行调查。
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 Elderly people aged 65 years or over by multistage sampling in 8 cities of Shandong Province were interviewed at home by trained interviewer.
方法采用分层抽样的方法对山东省8个城市65岁及以上老人进行抽样。
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。
We randomly selected 806 children under 6 years of age from 45 primary anganwadi (childcare) centres in Chandigarh, Punjab, India, that were chosen through multistage stratified random sampling.
在印度旁遮普省昌迪加尔的45所托儿所(anganwadi)中心采用多级分层随机取样法选择了806名6岁以下儿童。
Multistage realization is one of the most efficient methods to change the sampling rate of signal.
多级实现是改变信号采样速率最有效的方法之一。
Multistage stratified cluster sampling method was used for the sampling.
采用多阶段整群分层抽样方法。
Multistage stratified random sampling was conducted an interview survey in status of illness for children under 2 years old.
采用多阶段分层随机抽样法对2岁以下儿童进行疾病状况询问调查。
Methods: By using questionnaires with multistage stratified random cluster sampling method, 726 valid questionnaires of 800 were backed from the university students in 4 universities in Dalian city.
对象与方法：研究对象采取分层整群随机抽样的方法，在大连市4所高校大一、大四年级学生中发放问卷800份，收回有效问卷726份。
Methods: With the multistage stratified sampling, we randomly selected 400 normal children and 25 autism children as study samples.
方法采用多阶段分层随机抽样方法，选取了400例正常儿童和25例孤独症儿童为研究对象。
Methods Questionnaire and multistage stratified cluster sampling method were used for the survey.
方法进行问卷调查；采用多阶段整群分层抽样方法。
Method A total of 4 882 undergraduates from 6 universities in Shanxi province was investigated with multistage stratified random cluster sampling.
方法采用多阶段分层随机整群抽样方法调查山西省普通高校一、二、三年级本专科大学生4 882名。
Method A total of 4 882 undergraduates from 6 universities in Shanxi province was investigated with multistage stratified random cluster sampling.
方法采用多阶段分层随机整群抽样方法调查山西省普通高校一、二、三年级本专科大学生4 882名。
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