Sampling III
British medical journal(2010)
摘要
The prevalence, awareness, treatment, and control of hypertension in the general adult population of China were investigated. To ensure a representative sample of the population, the country was listed by locality (rural v urban communities) and then region (north v south). Twenty naturally occurring communities (clusters) were randomly selected, equally distributed between streets in urban areas and townships in rural areas for both the north and south. Within each cluster, equal numbers of men and women were randomly selected for each 10 year age range between 35 and 74 years.1 Which one of the following best describes the sampling method used in the above study?
更多查看译文
关键词
iii
AI 理解论文
溯源树
样例
![](https://originalfileserver.aminer.cn/sys/aminer/pubs/mrt_preview.jpeg)
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要