双重差分法stata代码
时间: 2023-09-05 12:11:51 浏览: 364
以下是使用Stata实现双重差分法的代码示例:
```
// 生成时间虚拟变量,1994年前为0,反之为1
gen period = (year >= 1994) & !missing(year)
// 生成区域的虚拟变量,干预为1,反之为0
gen treat = (country > 4) & !missing(country)
// 生成交叉项
gen did = period * treat
// 使用reg命令进行DID回归
reg y period treat did, r
```
另外,如果你想使用diff命令进行估计,你可以使用以下代码:
```
// 安装diff外部命令(如果未安装)
ssc install diff
// 使用diff命令进行估计
diff fte, t(treated) p(t) cov(bk kfc roys) robust
```
这些代码可以帮助你在Stata中实现双重差分法。请注意,具体的变量名和数据集名称需要根据你的实际情况进行修改。
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