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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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选择最近气象站
说明： 从plots文件中读取目标站点信息 从station文件读取气象站点信息 自动匹配距离目标站点最近的气象站名称(Automatically match the closest meteorogical station of subject plot.)
- 2019-04-18 10:59:48下载
- 积分：1
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PSTR
说明： R Programming implementation of panel smoothing threshold regression model
- 2020-11-08 09:59:47下载
- 积分：1
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Arma-Garch-Copula
说明： garch copula
带论文和code例句(garch copula
with paper and code)
- 2020-03-23 11:38:34下载
- 积分：1
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how to import data into R
在R中如何导入数据，主要是txt，csv，excel等数据格式的导入(how to imput data in R)
- 2018-06-13 21:26:22下载
- 积分：1
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R_codes
说明： 该文档中包含大量代码，首先是一些R语言基本语法练习的，然后是一些机器学习相关的，最后是一些评分卡指标计算、建模相关的。(This document contains a lot of code, first some basic grammar exercises of R language, then some machine learning related, and finally some scorecard index calculation, modeling related.)
- 2019-02-13 14:25:46下载
- 积分：1
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data
r语言配套分析的数据，代码。适合初学者进行使用(R language supporting analysis of data, code. Suitable for beginners)
- 2021-04-25 21:48:45下载
- 积分：1
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拟合优度卡方检验
说明： 对卡方检验进行拟合，计算理论分布，计算理论概率，作出检验(Fit chi square test, calculate theoretical distribution, calculate theoretical probability and make test)
- 2020-04-10 11:12:46下载
- 积分：1
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R数据可视化手册
本书提供了快速绘制高质量图形的150多种技巧，每个技巧用来解决一个特定的绘图需求。读者可以通过目录快速定位到自己遇到的问题，查询相应的解决方案。(This book provides more than 150 techniques for quickly drawing high quality graphics, each of which addresses a specific drawing requirement. Readers can quickly locate their own problems through the directory, query the corresponding solution.)
- 2020-06-25 16:00:02下载
- 积分：1
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pstr
说明： PSTR模型，解决面板数据的非线性关系问题，适合初学者使用(PSTR model, which solves the problem of non-linear relationship of panel data, is suitable for beginners to use.)
- 2020-11-08 09:49:47下载
- 积分：1
