抽样 [统计] sample; sampling; specimen; samples draw 按比例抽样样品 quota sample; 重复抽样 duplicate sampling; 概率抽样 (法) probability sampling; 从不同的零件中抽样检查 test the samples from different parts; 有意抽样 purposive sampling; 随机抽样 random sampling
分类 1.(使分别归类) classify; itemize; sort 根据起因将事故分类 classify accidents by cause; 根据性别[年龄; 民族; 地区] 分类 classify by sex [age; nationality; locality]; 邮局里的人员将信件按寄送地点分类。 men in the post office classify mail according to places it is to go. 它们是按品种分类的。 they are classified in sorts.2.(分门别类) classification; assortment; systematization; partition; sorting; taxonomy; breakdown 粗略的分类 a broad classification; 使分类系统化 systematize classification; 植物的分类 classification of plants
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