先将总体的单位按某种特征分为若干次级总体（层），然后再从每一层内进行单纯随机抽样，组成一个样本的统计学计算方法
分层抽样（stratified sampling）就是这样的方法，它从预先指定的组开始抽样。在最简单的情况下，尽管每组的大小不同，但是从每组抽取的对象个数相同。
基于2609个网页-相关网页
... stochastic programming 随机规划法 stochastic variable 分层抽样 stochastic variable 随机变数 ...
基于370个网页-相关网页
「分层抽样(Stratified random sampling) ：按照比例决定属性层，从每个属性层中，选择一个与属性层在母体规模中成比例的随机 ..
基于94个网页-相关网页
... strategy 策略 stratification sampling 分层抽样 stratification 分层 ...
基于92个网页-相关网页
分层抽样法 [统计] stratified sampling method ; stratified sampling ; method of stratified sampling
分层抽样品 stratified sampling
最优分层抽样 OPS Optimal Stratification Sampling
区域分层抽样 area stratified sampling
分层抽样协方差 [统计] covariance for stratified sampling
不等比例分层抽样 [统计] disproportionate stratified sampling
多次分层抽样 Stratified multiple stage sampling
整群分层抽样 cluster stratification sampling ; stratified cluster sampling
定比分层抽样法 proportionate stratified random sampling
Seen from the structure principle, stratified sampling method and optimized sampling method are rational and effective. In additional, constructing the optimal index investment portfolio is the most essential link in the two index investment methods.
从其构造原理中可以看出,分层抽样法和优化选样法是比较合理有效的构造方法,此外,指数投资组合的构建及其优化问题是这两种指数化构造方法中最关键的环节。
参考来源 - 指数投资组合优化方法的比较研究Furthermore, the stratified sampling strategy can also be successfully applied to the training set expansion during the bootstrapping process.5.
同时,将分层抽样理论应用于自举学习的训练集扩展,也能在一定程度上提高了关系抽取的性能。
参考来源 - 命名实体间语义关系抽取研究In the chapter4, concerning with sample technique in the durabilitytesting method, we present the delamination sampling method based on thegeneral standard sampling method. It is significant to help juding thequality stability of products in enterprises.
第四章，耐久性试验方法涉及到试验样品的抽取，根据一般抽样检验程序的基础上，给出了分层抽样的方法，分层抽样为判定由不同班组生产的产品的耐久性是否稳定提供了很好的抽样方法。
参考来源 - 电动钉枪耐久性评价方法与试验系统的开发·2,447,543篇论文数据，部分数据来源于NoteExpress
提出一种面向分类规则提取的分层抽样算法。
A stratify sampling algorithm for extracting classification rules is proposed in the dissertation.
在简单随机抽样方法的基础上提出了分层抽样的模糊综合评价模型。
A layered sampling model for fuzzy comprehensive evaluation was developed based on simple random sampling methods.
采用分层抽样方法，对36所学校、156间教室进行卫生学调查。
Hygiene investigation was carried out in 156 classrooms of 36 schools with stratification sampling.
应用推荐