我的数据时十年的31个省市的面板数据,需要按年份分成两组进行回归,执行xtreg,fe 回归,然后计算倾向值对比,请问哪位大神会分组啊,stata命令该怎么写呢。
Area Year jobless Income GDP Union PUP
Anhui 2003 4.1 6778 3923.1 30104 32
Anhui 2004 4.2 7511.4 4759.32 33349 33.5
Anhui 2005 4.4 8470.7 5375.12 35827 35.5
Anhui 2006 4.2 9771.1 6148.73 40194 37.1
Anhui 2007 4.06 11473.6 7364.18 47327 38.7
Anhui 2008 3.92 12990.4 8874.17 53600 40.5
Anhui 2009 3.92 14085.7 10062.8 57519 42.1
Anhui 2010 3.66 15788.2 12359.3 61256 43.01
Anhui 2011 3.77 18606.1 15300.7 81569 44.8
Anhui 2012 3.7 21024.2 17212.1 104452 46.5
Beijing 2003 1.4 13882.6 5023.77 14048 79.05
Beijing 2004 1.3 15637.8 6060.28 14571 79.53
Beijing 2005 2.1 17653 6886.31 13469 83.62
Beijing 2006 2 19977.5 7870.28 14834 84.33
Beijing 2007 1.84 21988.7 9353.32 16530 84.5
Beijing 2008 1.82 24724.9 10488 19315 84.9
Beijing 2009 1.44 26738.5 12153 20841 85
Beijing 2010 1.37 29072.9 14113.6 22112 85.96
Beijing 2011 1.5 32903 16251.9 28399 86.2
Beijing 2012 1.3 36468.8 17801 29260 86.2