我需要合并两个数据集(data1.dta
&& data2.dta
):merge 1:1 personid using data2
但是我不想包括所有变量data2
。有什么方法可以指定 data2
我想要包含的变量列表merge
吗?
您可以使用keep
:
// saving `data2` under a different name
...
save temporary
keep personid var1 var2 //list here all variables that you want to keep
merge 1:1 personid using temporary
erase temporary
// done!
或者只是这样:
// var1 var2 etc. are the variables that you want to keep
merge 1:1 personid using temporary, keepusing(var1 var2)