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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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R
说明： R语言舍选法、极坐标法、Box-Muller变换产生正态随机变量(R Language Rounding Method, Polar Coordinate Method and Box-Muller Transform to Generate Normal Random Variables)
- 2019-03-05 11:47:53下载
- 积分：1
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数据挖掘 R语言实战
说明： 通过本书，读者不仅能掌握使用R及相关算法包来快速解决实际问题的方法，而且能从实际问题分析入手，到利用R进行求解，以及对挖掘结果进行分析的全面训练(Through this book, readers can not only master the method of using R and relevant algorithm packages to quickly solve practical problems, but also start from the analysis of practical problems to the comprehensive training of using R to solve problems and analyzing mining results)
- 2020-06-25 16:20:01下载
- 积分：1
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R语言实战（第2版）中文
说明： 该书是一本较好的R语言编程书籍，从认识到实战，手把手教你如何使用R语言进行数据分析、挖掘、画图等等。(This book is a good R language programming book, from understanding to actual combat, teach you how to use R language data analysis, mining, drawing and so on.)
- 2020-06-25 16:40:02下载
- 积分：1
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小提琴图 (1)
The source code of data analysis using R language does not contain data sets. If you need to contact us
- 2019-02-23 14:46:45下载
- 积分：1
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Sem
利用R语言SEM程序包进行通径分析，简单易学，容易上手(SEM path analysis model)
- 2020-11-27 17:39:34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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11-27-model
利用R软件建立混合效应模型，对于不同随机效应参数的混合模型进行对比(develop the mixed-effects models and compare the goodness-of-fit)
- 2018-03-19 20:53:48下载
- 积分：1
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spatial autocorrelation
利用R语言进行两个变量的空间自相关分析，从而进行克里金插值(The spatial autocorrelation analysis of two variables is carried out by using R language.)
- 2018-08-07 09:59:00下载
- 积分：1
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bootRes包算相关系数
R 语言 bootRes包算相关系数 计算bootstrapped 相关系数(calculate bootstrapped correlation)
- 2021-04-19 11:38:54下载
- 积分：1
