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从DID的模型设置来看，要想使用DID必须满足以下两个关键条件：一是必须存在一个具有试点性质的政策冲击，这样才能找到处理组和对照组，那种一次性全铺开的政策并不适用于DID分析；二是必须具有一个相应的至少两年（政策实施前后各一年）的面板数据集。 本文介绍双重差分法 (DID)的基本概念及其在政策评估中的应用，通过实例解析了如何利用DID评估政策效果，包括设定treated和time变量、满足平行趋势假设的方法以及如何解读分析结果。 本文深入解析双重差分模型（DID）的各种类型及其应用，包括传统DID、经典DID、异时DID、广义DID和异质性DID，通过实例演示平行趋势检验和实证分析，适用于政策评估和经济分析。
Even in 2023 and 2024 we continue to see improvements to existing packages and new releases 不过，双重差分法（DID）是一个大家族，除了标准DID模型之外，还存在多种扩展的（准）DID模型，今天咱们就来总结和梳理一下“DID大家族”的成员信息。 More applications are also coming out
Dissociative identity disorder (did) is a mental health condition where you have two or more separate personalities that control your behavior at different times.
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