在运用面板数据模型进行实证分析时，由于使用的样本数据包含了个体、时间、指标三个方向上的信息，因此模型形式的设定非常关键。
When doing the empirical analysis with the Panel-Data model, it is crucial to set the form of model correctly, because the sample data includes the information of individual, time, and so on.
森林土壤取样的研究结果表明：基于设计的取样策略主要建立于传统的调查取样的基础上，需要多少样本，研究区应设定多大范围是设计考虑的主要内容。
Result of forest soil sampling indicates that: design-based approach is mainly based on the traditional investigation, the number of samples and study area are mostly considered by this approach.
针对以往并购绩效研究的缺陷，本文加大了考察期并设定了严格的样本筛选标准。
It lengthens the observation period of mergers and acquisitions performance and sets strict screening standards of samples against the previous research deficiencies.
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