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did
双重差分估计
双重差分模型（difference-in-difference，DID）近年来多用于计量经济学中对于公共政策或项目实施效果 的定量评估。
通常大范围的公共政策有别于普通科研性研究，难以保证对于政策实施组和对照组在样本分配上的完全随机。非随机分配政策实施组和对照组的试验称为自然试验（naturaltrial），此类试验存在较显著的特点，即不同组间样本在政策实施前可能存在事前差异，仅通过单一前后对比或横向对比的分析方法会忽略这种差异，继而导致对政策实施效果的有偏估计。(Quantitative evaluation of policy or project implementation effect. Generally, a wide range of public policies is different from general scientific research, and it is difficult to ensure that the sample allocation for the policy implementation group and the control group is completely random. The non-randomly assigned policy implementation group and the control group are called natural trials, which have significant characteristics, i.e. there may be prior differences between the different groups of samples before the implementation of the policy, and this difference will be ignored only through a single pre-and post-comparison or horizontal comparison analysis method, which leads to the policy. Biased estimation of implementation)
- 2020-07-03 20:00:01下载
- 积分：1
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Line follower robot using PIC 16F877A
直线跟随机器人是一种自主运输机器人。它是用16F877A实现的，用CCS编码编译器.CODE包括掉头、停止、转弯等命令。
- 2022-08-25 16:08:18下载
- 积分：1
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Uma modelagem de um cenario basico para quem esta aprend o a usar open/gl na pla...
Uma modelagem de um cenario basico para quem esta aprend o a usar open/gl na plataforma C++. Utilizando comandos basicos como setas direcionais e teclas especiais como home, end, page up e page down voce pode navegar por todo o ambiente 3D com muita facilidade.-Uma modelagem de um cenario basico para quem esta aprendendo a usar open/gl na plataforma C++. Utilizando comandos basicos como setas direcionais e teclas especiais como home, end, page up e page down voce pode navegar por todo o ambiente 3D com muita facilidade.
- 2022-01-30 16:54:31下载
- 积分：1
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腾讯带滚动条相册特效
腾讯带滚动条相册特效,jquery,滚动条,相册特效,图片切换,相册代码,(Tencent with scrollbar album effects, jquery, scrollbar, album effects, picture switching, album code,)
- 2019-02-16 22:43:54下载
- 积分：1
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1_ChronoFEA_ANCF
说明： ANCF的有限元说明文件，里面有ANCF附有代码程序及ANCF的实现方法。(ANCF finite element description document, which contains ANCF with code procedures and ANCF implementation methods.)
- 2019-04-26 09:03:52下载
- 积分：1
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Python机器学习算法
说明： python机器学习算法，相关算法的python实现。(Python machine learning algorithm)
- 2019-04-18 09:53:04下载
- 积分：1
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串口通讯
说明： labview串口通讯,读取串口数据，显示数据(Serial Communication, read serial data, display data)
- 2020-12-26 20:49:56下载
- 积分：1
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POT package
pot模型参数估计, 其中有个超额均值函数图, 以及超额数按gpd分布拟合后的残差与指数分布的q-q图(Extreme value theory ; POT model)
- 2021-02-26 15:29:38下载
- 积分：1
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jQuery隐藏、展开UL li评论列表任意内容项
jQuery隐藏、展开UL li评论列表任意内容项，需要展开哪一项，鼠标点击标题文字即可，再点点击则重新收起来，类似于单击展开文字内容的功能。
- 2023-01-30 04:35:04下载
- 积分：1
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成都市空气中的O3来源及分析 O3_air
成都市空气中的O3来源及分析，可用于大创项目(O3 source and analysis in air of Chengdu, which can be used in some projects)
- 2020-06-22 01:40:02下载
- 积分：1
