To introduce sample selection model and its estimation method.
介绍样本选择模型及其估计方法。
A new method is proposed for sample selection in large data set.
提出了一种大规模数据集的训练样本选择方法。
In this sample scenario, you define a policy for manufacturing plant selection.
在这个示例的场景中，您为生产厂商的选择定义了一个策略。
Part three: the design of the questionnaire and the selection of sample.
第三部分：调查问卷的设计和样本选择。
Part three: the design of the questionnaire and the selection of sample.
第三部分：调查问卷的设计和样本选择。
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