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六、关于二阶抽样二阶抽样的模式可示意如下图。首先把总体划分成若干较大的单元,称为一阶单元,而每个一阶单元又被划分成若干个单元称为二阶单元。图中总体被分成16个一阶单元,而每个一阶单元又被划分成9个二阶单元。二阶抽样是在总体内首先随机(或机械)地抽取若干(此处为4个)一阶单元,再在每个抽中的一阶单元内随机(或机械)地抽取若干(此处为3个)二阶单元进行实测,由此对总体各单元的平均值作出估计的抽样调查方式。
Sixth, on the second-order sampling Second-order sampling patterns can be illustrated as shown below. First, the overall division into a number of larger units, called the first-order unit, and each first-order unit is divided into several units called second-order unit. The figure is generally divided into 16 first-order units, and each first-order unit is divided into 9 second-order units. The second-order sampling is to first randomly (or mechanically) extract a number of (in this case, four) first-order units in the population and then randomly (or mechanically) extract a number of first-order units 3) second-order units were measured, thus making an average of all the units to make a sample survey.