请问能否有简单的stata操作code呢?今天想了一天也没有搞明白,因为要计算一个指标,困扰了我好久。跪求论坛里的大神帮忙,谢谢!
| country_1 | country_2 | year | sector | export | value |
| 100 | 101 | 2011 | 11 | 500 | 3450 |
| 100 | 101 | 2011 | 12 | 600 | 3450 |
| 100 | 101 | 2011 | 13 | 700 | 3450 |
| 100 | 102 | 2011 | 11 | 200 | 3250 |
| 100 | 102 | 2011 | 12 | 300 | 3250 |
| 100 | 102 | 2011 | 13 | 400 | 3250 |
| 100 | 102 | 2011 | 14 | 550 | 3250 |
| 100 | 103 | 2011 | 12 | 100 | 740 |
| 100 | 103 | 2011 | 13 | 200 | 740 |
| 101 | 100 | 2011 | 11 | 500 | 1500 |
| 101 | 100 | 2011 | 13 | 600 | 1500 |
| 101 | 102 | 2011 | 14 | 300 | |
| 101 | 102 | 2011 | 12 | 200 | |
| 101 | 103 | 2011 | 14 | 100 | |
| 102 | 100 | 2011 | 11 | 200 | |
| 102 | 100 | 2011 | 14 | 100 | |
| 102 | 101 | 2011 | 11 | 200 | |
| 102 | 101 | 2011 | 12 | 200 | |
| 102 | 101 | 2011 | 13 | 300 | |
| 102 | 101 | 2011 | 14 | 400 | |
| 102 | 103 | 2011 | 11 | 500 | |
| 102 | 103 | 2011 | 12 | 440 | |
| 103 | 100 | 2011 | 13 | 200 | |
| 103 | 101 | 2011 | 11 | 450 | |
| 103 | 101 | 2011 | 12 | 500 | |
| 103 | 102 | 2011 | 12 | 600 | |
| 103 | 102 | 2011 | 14 | 700 | |
| 100 | 101 | 2012 | 11 | 200 | 1500 |
| 100 | 101 | 2012 | 12 | 300 | 1500 |
| 100 | 101 | 2012 | 14 | 250 | 1500 |
| 100 | 102 | 2012 | 11 | 400 | |
| 100 | 102 | 2012 | 12 | 700 | |
| 100 | 102 | 2012 | 13 | 300 | |
| 100 | 102 | 2012 | 14 | 400 | |
| 100 | 103 | 2012 | 12 | 100 | |
| 100 | 103 | 2012 | 14 | 50 | |
| 101 | 100 | 2012 | 11 | 70 | |
| 101 | 100 | 2012 | 13 | 800 | |
| 101 | 102 | 2012 | 14 | 770 | |
| 101 | 102 | 2012 | 12 | 330 | |
| 101 | 103 | 2012 | 13 | 440 | |
| 102 | 101 | 2012 | 11 | 100 | |
| 102 | 101 | 2012 | 12 | 200 | |
| 102 | 101 | 2012 | 13 | 300 | |
| 102 | 101 | 2012 | 14 | 400 | |
| 102 | 103 | 2012 | 11 | 330 | |
| 102 | 103 | 2012 | 14 | 440 | |
| 103 | 100 | 2012 | 13 | 200 | |
| 103 | 101 | 2012 | 11 | 450 | |
| 103 | 101 | 2012 | 13 | 500 | |
| 103 | 102 | 2012 | 12 | 600 | |
| 103 | 102 | 2012 | 14 | 700 |
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