各位大侠：我需要进行discrete hazard model (logit)回归，查询了stata help。
采用了如下的回归code
xi: dthaz y x1 x2 x3 i.year
stata提示“variable _period not found” ，说明code或数据有问题，这个问题不知道是什么原因，能不能帮忙解决，万分感谢！
我的原始数据大致如下
| stkcd | y | x1 | x2 | x3 | year |
1 | 0 | 3.2 | 1 | 10.2 | 2007 |
1 | 0 | 3 | 0 | 10.1 | 2008 |
1 | 0 | 2.8 | 0 | 10 | 2009 |
1 | 0 | 2.6 | 0 | 9.9 | 2010 |
1 | 1 | 2.4 | 0 | 9.8 | 2011 |
2 | 0 | 2.2 | 0 | 9.7 | 2007 |
2 | 0 | 2 | 0 | 9.6 | 2008 |
2 | 0 | 1.8 | 0 | 9.5 | 2009 |
2 | 1 | 1.6 | 0 | 9.4 | 2010 |
3 | 0 | 4.2 | 0 | 9.3 | 2007 |
3 | 0 | 4.1 | 0 | 9.2 | 2008 |
3 | 0 | 4.05 | 0 | 9.1 | 2009 |
3 | 0 | 3.966667 | 1 | 7.5 | 2010 |
3 | 0 | 3.891667 | 0 | 7.45 | 2011 |
3 | 0 | 3.816667 | 0 | 7.4 | 2012 |
4 | 0 | 3.741667 | 0 | 7.35 | 2007 |
4 | 0 | 3.666667 | 1 | 7.3 | 2008 |
4 | 0 | 3.591667 | 0 | 7.25 | 2009 |
4 | 0 | 3.516667 | 0 | 7.2 | 2010 |
4 | 0 | 3.441667 | 0 | 7.15 | 2011 |
4 | 1 | 3.366667 | 1 | 7.1 | 2012 |
5 | 0 | 3.291667 | 0 | 7.05 | 2007 |
5 | 0 | 3.216667 | 1 | 7 | 2008 |
5 | 0 | 3.141667 | 0 | 6.95 | 2009 |
5 | 0 | 3.066667 | 1 | 6.9 | 2010 |
5 | 0 | 2.991667 | 1 | 4.5 | 2011 |
5 | 0 | 2.916667 | 1 | 4.55 | 2012 |
6 | 0 | 1.05 | 0 | 4.6 | 2007 |
6 | 0 | 1.06 | 1 | 4.65 | 2008 |
6 | 0 | 1.07 | 0 | 4.7 | 2009 |
6 | 0 | 1.08 | 0 | 4.75 | 2010 |
6 | 0 | 1.09 | 0 | 4.8 | 2011 |
6 | 0 | 1.1 | 0 | 4.85 | 2012 |
6 | 1 | 1.11 | 0 | 4.9 | 2013 |
7 | 0 | 1.12 | 0 | 4.95 | 2008 |
7 | 0 | 1.13 | 0 | 5 | 2009 |
7 | 0 | 1.14 | 0 | 5.05 | 2010 |
7 | 0 | 1.15 | 0 | 5.1 | 2011 |
7 | 1 | 1.16 | 0 | 5.15 | 2012 |
8 | 0 | 1.17 | 1 | 5.2 | 2008 |
8 | 0 | 1.18 | 0 | 5.25 | 2009 |
8 | 0 | 1.19 | 1 | 9.7 | 2010 |
8 | 0 | 1.2 | 0 | 9.6 | 2011 |
8 | 1 | 1.21 | 0 | 9.5 | 2012 |
9 | 0 | 2.03 | 0 | 9.4 | 2008 |
9 | 0 | 2.035 | 0 | 9.3 | 2009 |
9 | 0 | 2.04 | 0 | 9.2 | 2010 |
9 | 0 | 2.045 | 0 | 9.1 | 2011 |
9 | 0 | 2.05 | 0 | 7.5 | 2012 |
10 | 0 | 2.055 | 1 | 7.45 | 2008 |
10 | 0 | 2.06 | 0 | 7.4 | 2009 |
10 | 0 | 2.065 | 0 | 7.35 | 2010 |
10 | 0 | 2.07 | 0 | 7.3 | 2011 |
10 | 0 | 2.075 | 0 | 7.25 | 2012 |
10 | 1 | 2.08 | 0 | 7.2 | 2013 |
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