分组抽样方法是最常用的，因为在紧急情况的初期，人们很少住在有组织的环境中。
The cluster sample method is most often used because, in the initial stages of emergencies, people are rarely living in a structured pattern.
分组抽样，即测量随机的家庭“组”，一般用于不均匀地分散在较大面积地理区域的人群。
Cluster sampling, in which random "clusters" of households are measured, is used in populations that are not in even or structured Settings but are spread unevenly over a large geographic area.
从所有的区域和它们的估计人口列表中得到总分组数，再将总分组数除以30得到分组抽样间隔k。
The total number of clusters, drawn from a list of all sections and their population estimates, is divided by 30 to obtain the cluster interval K.
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