test1.part09

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)

说明：  模糊支持向量机算法，模糊聚类算法，模糊分类器(display.m Fcm3.m distfcm.m FuzzyCM.m)

说明：  电弧仿真,各种参数，可以方便大家进行学习，和修改参数(Arc simulation, various parameters, can facilitate everyone to learn, and modify parameters)

服务端代码 3.5的在。... ... ..... -server code in 3.5. That clause 8

能够绘制数字电路的时序图，是fpga工程师时序设计和分析的神器(for digital circuit timming design and analysis)

文件中包含了完整的HHT变换的文件，并给出了如何利用EMD分解进行不同频率成分的信号分离，提取不同频率成分信号的信息的例子。(The file contains a complete HHT transform file, and gives an example of how to use EMD decomposition to separate signals with different frequency components and extract the information of signals with different frequency components.)

脚本简介一款jQuery实现的带标题简介的左右移动的图片相册代码(The script introduces a jQuery-implemented photo album code that moves left and right with a title profile)

资源描述老师大作业，五子棋，包括人人对战，人机对战

Control para codigos de barra, muy util para sistemas de inventario.

太阳能水泵（亦称光伏水泵），是当今世界上阳光丰富地区，尤其是缺电无电的边远地区最具吸引力的供水方式，利用随处可取、取之不竭的太阳能，系统全自动地日出而作，日落而歇，无需人员看管，维护工作量可降至最低，是理想的集经济性、可靠性和环保效益为一体的绿色能源系统。(Solar energy pumps (also known as photovoltaic pumps) are the most attractive way of water supply in sunny areas in the world, especially in remote areas where there is no electricity or electricity. By using the available and inexhaustible solar energy, the system can be fully automatic sunrise, sunset and rest, without human supervision, and maintenance workload can be minimized. It is an ideal green energy system integrating economy, reliability and environmental benefits.)