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·2,447,543篇论文数据，部分数据来源于NoteExpress
以上来源于: WordNet
Methods: The stratified sampling and cluster random sampling methods are used in this survey.
方法：本研究采用分层随机抽样方法和整群随机抽样方法。
Methods With stratified sampling and cluster sampling, we investigate 487 families in poverty.
方法采用分层整群抽样方法调查487户贫困家庭。
Methods A large-scale survey was conducted at 250 medical health units based on stratified sampling.
方法使用分层抽样的方法在全国范围内抽取250家医疗机构开展大规模调查。
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