...影响为了从实证研究层面找到这个问题的答案,我们使用了常被用于政策效果检验的双重差分模型(difference-in-difference model)在双重差分模型中,需要构造试验组和控制组,比较一个试验公司在股改前后与控制公司的双重差异,以此排除未能预见因素的干扰,而...
基于16个网页-相关网页
...证明研究层面找到这个需要解答的题目的谜底,咱们施用了常被用于政策效验查验的两重差分模子(difference-in-difference model)在两重差分模子中,需要机关实验组和节制组,比力1个实验公司在股改先后与节制公司的两重差异,以资解除未能预感因素的滋扰,而股...
基于12个网页-相关网页
As raster grid networks of digital elevation model in GIS can be used as the finite difference mesh, the continuity and momentum equations are solved numerically using the finite difference method.
由于GIS中的栅格网络数据可以直接作为有限差分的网格,二维数值模型可用有限差分来求解。
In the model, approximate quality difference of two evaluations in the same level is computed by rough sets, and the importance degree is determined by difference. The model is validated by instance.
应用粗糙集理论计算相同层次两两评价指标的近似质量差,根据差的大小确定指标重要性,并通过实例证明了该模型的合理性和正确性。
It has been focused in compute vision research fields. A improved HSI image difference model based on sequences image difference and second image difference is presented.
给出连续图像帧差分和二次帧差分改进的图像HSI差分模型,采用自适应分割算法能在任意条件下自动提取运动目标区域。
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