以下是原始数据:
- * Example generated by -dataex-. To install: ssc install dataex
- clear
- input str7 股票代码 str3 人名 int(起始年份 终止年份)
- "‘0001" "Bil" 2008 2010
- "‘0001" "Bil" 2011 2011
- "‘0001" "Amy" 2011 2013
- end
| 股票代码 | 人名 | 起始年份 | 终止年份 |
| ‘0001 | Bil | 2008 | 2010 |
| ‘0001 | Bil | 2011 | 2011 |
| ‘0001 | Amy | 2011 | 2013 |
以下是期望得到的数据
- * Example generated by -dataex-. To install: ssc install dataex
- clear
- input str7 股票代码 int 年份 byte 标记
- "‘0001" 2005 0
- "‘0001" 2006 0
- "‘0001" 2007 0
- "‘0001" 2008 1
- "‘0001" 2009 1
- "‘0001" 2010 1
- "‘0001" 2011 1
- "‘0001" 2012 1
- "‘0001" 2013 1
- "‘0001" 2014 0
- "‘0001" 2015 0
- end
| 股票代码 | 年份 | 标记 |
| ‘0001 | 2005 | 0 |
| ‘0001 | 2006 | 0 |
| ‘0001 | 2007 | 0 |
| ‘0001 | 2008 | 1 |
| ‘0001 | 2009 | 1 |
| ‘0001 | 2010 | 1 |
| ‘0001 | 2011 | 1 |
| ‘0001 | 2012 | 1 |
| ‘0001 | 2013 | 1 |
| ‘0001 | 2014 | 0 |
| ‘0001 | 2015 | 0 |


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