*************数据如下
- * Example generated by -dataex-. To install: ssc install dataex
- clear
- input float id str2 ind2
- 1 "43"
- 1 "44"
- 1 "44"
- 1 "44"
- 1 "44"
- 1 "44"
- 1 "44"
- 1 "44"
- 1 "44"
- 1 "44"
- 2 "44"
- 2 "44"
- 2 "44"
- 2 "44"
- 2 "44"
- 2 "44"
- 2 "44"
- 2 "44"
- 2 "44"
- 2 "44"
- 3 "44"
- 3 "44"
- 3 "44"
- 3 "44"
- 3 "44"
- 3 "44"
- 3 "44"
- 3 "44"
- 3 "44"
- 3 "44"
- 4 "26"
- 4 "26"
- end
***********
我的数据如上,我的问题:按照id发现,同一个id却对应了不同的ind2,比如id==1的样本,对应的行业分别有43和44,而我想删除 id=1 ind2=43这一条样本,诸如此类(我的样本有200万,不可能按照id逐个check),该如何编写命令?