Abstract: To settle the numbers of groups, the moth and features of group sampling are analysed, and its estimator is goven.Then using CauchySchwartz unequility, it seeks the best apportion with finite cost.

• 文摘:为了确定分类抽样的各类单位数；分析了分类抽样的抽取方法和特点；同时给出其简单估计；然后利用柯西-施瓦茨不等式推导出在给定调查费用情况下的最优分配.