“cluster sampling”造句，怎么用cluster sampling造句

5、DESIGN: a stratified random cluster sampling investigation.

7、This paper discusses cluster sampling and stratified cluster sampling in continuous surveys with censuses.

9、Methods With stratified sampling and cluster sampling, we investigate 487 families in poverty.

11、Methods The questionnaire survey was conducted among 1 700 college students with stratified-cluster sampling method.

13、Stratified two-stage cluster sampling on unrelated question model for quantitative sensitive questions

15、Methods. The survey was conducted according to multi-stage stratified cluster sampling method.

17、Methods Female college students were sampled by cluster sampling and investigated by using questionnaire survey on anonymous basis.

19、Preschool students were selected by random cluster sampling from Songgang street of Bao an district in Shenzhen city.

21、A cluster sampling technique was used to measure physique development of 871 children aged 4-6 years in Xingan county, Guangxi Zhuang Autonomous Region.

23、Methods A scene cross-sectional survey was made for 3676 students in the four grades from four universities selected using the multi-stratified cluster sampling approach in Urumqi.

25、Methods the sampled students, which were taken out from the all middle schools in Sanming city by means of randomized stratification cluster sampling, were investigated with AAT (adaptability test).

27、Method:A cluster sampling study on the condition of injuries was conducted among 1059 rural inhabitants in a certain township in Tongjiang County, Sichuan province from Jan 1998~Jan 1999.

1、relative variance for cluster sampling

3、Methods Randomly cluster sampling method was applied.

6、Method cluster sampling and cross sectional study.

10、Methods An anonymous survey was conducted among 502 students from a technical college selected by stratified sampling and cluster sampling.

14、Contrast group:Other 218 undergraduates were adopted in cluster sampling,taking class as unit.

18、Methods a cluster sampling and canonical research were adopted to investigated 996 children and their parents with a questionnaire.

22、Methods Serum uric acid (SUA) was measured among 7778 inhabitants aged over 20 years old in 2 communities in Nanjing with the method of stratified cluster sampling.

26、Methods the stratified randomly cluster sampling was applied by well-trained investigators, and the inquired subject was either householder or the family member who is familiar with the family things.

2、DESIGN: a cluster sampling and simple randomized sampling survey.

8、DESIGN: Random cluster sampling methods and a cross-section survey.

16、cluster sampling: When the Basic sampling unit in the population is to be found in groups or clusters the sampling is sometimes carried out by selecting a sample of clusters and observing all the members of each selected cluster.

24、Methods with cluster sampling method, 726 junior middle school students and 2 091 senior middle school students from 6 middle schools in Hefei were investigated with questionnaire.

4、estimation of proportions in cluster sampling

20、METHODS: A total of 478 children at age of 9-12 years from Tulufan City and Buerjin County of Xinjiang Province were enrolled by random cluster sampling.

12、Methods:Adopt the method of stratified cluster sampling, women were investigated through questionnaire in family.

28、Methods a questionnaire was used to survey injury -related knowledge, attitude and behavior of 42 065 students drawn from 4 counties of Zhejiang province by using a cluster sampling method.