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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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Visual C# 隐藏、显示开始按钮
C# 隐藏、显示开始按钮,把Windows的开始菜单隐藏起来,看不到“开始”菜单了,Windows7则隐藏了窗口图标,不过这样会很不方便哦,本源码只是学习C#与Windows之间的相关编程技巧,下面的代码实现了隐藏显示开始菜单的功能:
[DllImport("user32.dll")]//寻找窗口列表中第一个符合指定条件的顶级窗口
public static extern int FindWindow(string lpClassName, string lpWindowName);
[DllImport("user32.dll")]//在窗口列表中寻找与指定条件相符的第一个子窗口
public static extern int FindWindowEx(int hWnd1, int hWnd2, string lpsz1, string lpsz2);
[DllImport("user32.dll")]//控制窗口的可见性
public static extern int ShowWindow(int hwnd, int nCmdShow);
private void button1_Click(object sender, EventArgs e)
{
if (radioButton1.Checked)
ShowWindow(FindWindowEx(FindWindow("Shell_TrayWnd", null), 0, "Button", null), SW_HIDE);//隐藏开始按钮
else if (radioButton2.Checked)
ShowWindow(FindWindowEx(FindWindow("Shell_TrayWnd", null), 0, "Button", null), SW_SHOW);//显示开始按钮
}
- 2022-05-20 11:42:02下载
- 积分:1
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ArcObjects(hanpeng)
gis行业韩鹏VC+AO二次开发资料gis行业韩鹏VC+AO二次开发资料gis行业韩鹏VC+AO二次开发资料gis行业韩鹏VC+AO二次开发资料(gis industries Han Peng VC+ AO secondary development of information industry, gis Han Peng VC+ AO secondary development of information industry, gis Han Peng VC+ AO secondary development of information industry, gis Han Peng VC+ AO secondary development of information)
- 2009-09-30 10:51:29下载
- 积分:1
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Steel_Fiber_Matlab
说明: 可以在混凝土构件内生成随机纤维,可设定纤维数量、构件形状(Random fibers can be generated in the concrete member, and the number of fibers and the shape of the member can be set)
- 2021-02-01 17:31:51下载
- 积分:1
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VC++ 词法分析-有穷自动机内核分析源码
VC++ 词法分析-有穷自动机内核分析源码,为 DocWizard 做词法分析准备,本分析内核可以在不改变代码的情况下分析不同的 DFA。
- 2022-03-02 11:49:57下载
- 积分:1
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GUI在Scilab使用过滤器
应用背景一个软件的图形用户界面(GUI)把一个过滤器运用于数字图像。过滤器的初始图像和参数都要处理的图形用户界面元素。此外,图形用户界面将处理过滤掉图像的生成。使用过滤器:过滤器,fspecial,拉普拉斯,α关键技术不同功能的工具箱支持:图像处理设计(IPD),图像处理工具箱(IPT)和Scilab图像和视频处理工具(SIVP)。图形用户界面生成器;
- 2022-10-27 19:15:04下载
- 积分:1
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校园二手交易系统,具有完备的后台操作以及应用功能!
校园二手交易系统,具有完备的后台操作以及应用功能!-campus secondary trading systems, has a sound background and the application of functional operation!
- 2023-05-27 02:25:02下载
- 积分:1
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DeMultiwave
读取segy文件,消除多次波
的地震处理运用(segy read documents, eliminating the multiple use of seismic processing)
- 2007-02-16 12:23:48下载
- 积分:1
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ReadingTool
看小说软件,可按键盘快捷键使软件窗口消失和出现以及翻页,可自由调整软件窗口尺寸,本软件可打开已下载好的小说(Read the novel software, keyboard shortcut keys can make the software window disappear and appear, and page turning, can adjust the size of the software window freely, this software can open the downloaded novel.)
- 2020-06-20 04:00:02下载
- 积分:1
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arraysignal.ppt
说明: 阵列信号处理,ppt总结,200页,比较详细,帮助掌握空间传播波携带信号的获取与处理的基本理论和方法,特别是空时多维信号算法,熟悉参数估计和自适应波束形成的常用算法。(Array signal processing, PPT summary, 200 pages, more detailed, to help master the basic theory and method of acquisition and processing of spatial propagation wave carrying signals, especially space-time multidimensional signal algorithm, familiar with common algorithms of parameter estimation and adaptive beamforming.)
- 2019-12-01 16:36:10下载
- 积分:1