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Did是一种方式，一种想办法探究事物因果关系的方式。 第一个问题：计量经济学里的「did」是啥意思？ did的英文全称是 difference-in-differences，翻译过来就是“ 双重差分法 ”。 别被这名字吓到，咱们把它拆开看： difference (差分)：就是做减法，算个差值。 上海话骂人方言上海话骂人方言如下：1、综桑 （畜生）2、乡吾宁：乡下人、外地人，地方来的，含鄙视义。3、港卵。4、册那 相当于国骂的***的。5、弄就是蟑螂帮蚯蚓额杂交体。6、侬喋扎赤佬。7、弄就是沉睡在南极下面 · 多期数据did操作指南 一、did基本原理 多期did（difference-in-differences）常用于政策评估效应研究，通过对比实验组和控制组在政策实施前后的差异，来分析政策效应。在本案例中，我们研究的是“开通高铁”对gdp的影响，其中a类地区为控制组，b类地区为实验组，2016年为政策实施年份。 二、数据准备.
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