请问应该怎么做,麻烦大家帮忙解答一下,谢谢!
- * Example generated by -dataex-. To install: ssc install dataex
- clear
- input str6(证券代码 季度日期)
- "000009" "2016q2"
- "000009" "2016q3"
- "000009" "2017q2"
- "000009" "2017q3"
- "000009" "2018q3"
- "000100" "2016q3"
- "000100" "2016q4"
- "000100" "2018q2"
- "000100" "2018q4"
- "000732" "2016q4"
- "001965" "2018q2"
- "001965" "2018q4"
- "001979" "2018q3"
- end


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