黃河泉 发表于 2020-4-12 17:09 
试试 (你没附上 treatment 变量)
非常感谢黄老师!您给的这个还是不行。treatment就是一个0-1变量,东部为1,内陆为0.
clear
. input str4 id year y x
id year y x
1.
. id year y x treatment
'year' cannot be read as a number
1. 1 2006 8.995862834 1.314005749 1
2. 1 2007 9.134663488 1.313395137 1
3. 1 2008 9.29189044 1.351067762 1
4. 1 2009 9.334627855 1.362875546 1
5. 1 2010 9.445025782 1.386851608 1
6. 1 2011 9.593772456 1.364758983 1
7. 1 2012 9.717826282 1.371287472 1
8. 1 2013 9.755826345 1.381851204 1
9. 1 2014 9.820893114 1.390423772 1
10. 1 2015 9.893713607 1.399208604 1
11. 1 2016 9.95423646 1.405643424 1
12. 1 2017 9.991276495 1.418281649 1
13. 2 2006 9.227877874 1.133250337 0
14. 2 2007 9.319482845 0.99834282 0
15. 2 2008 9.447084728 1.047884568 0
16. 2 2009 9.390435157 1.088204624 0
17. 2 2010 9.499129677 1.021836106 0
18. 2 2011 9.587368383 0.906230732 0
19. 2 2012 9.687227305 0.777114453 0
20. 2 2013 9.755243425 0.769725172 0
21. 2 2014 9.676034286 0.792944745 0
22. 2 2015 9.632531359 0.848061083 0
23. 2 2016 9.64917268 0.957619564 0
24. 2 2017 9.680537048 1.006143607 0
25. 3 2006 9.603531119 1.313080596 1
26. 3 2007 9.793564098 1.352550258 1
27. 3 2008 9.931200947 1.363923252 1
28. 3 2009 10.14841748 1.372445978 1
29. 3 2010 10.27169657 1.33293742 1
30. 3 2011 10.3885935 1.340521895 1
31. 3 2012 10.54002063 1.352837675 1
32. 3 2013 10.63318874 1.384702484 1
33. 3 2014 10.6373699 1.392465268 1
34. 3 2015 10.71609878 1.411482685 1
35. 3 2016 10.71827492 1.437308132 1
36. 3 2017 10.38508178 1.453949588 1
37. 4 2006 9.045709092 1.415755701 0
38. 4 2007 9.143915462 1.424442929 0
39. 4 2008 9.266309177 1.46974404 0
40. 4 2009 9.28958391 1.499511881 0
41. 4 2010 9.482212464 1.497785795 0
42. 4 2011 9.64995004 1.495011905 0
43. 4 2012 9.72020662 1.498131227 0
44. 4 2013 9.701774469 1.507241431 0
45. 4 2014 9.693730936 1.520240007 0
46. 4 2015 9.769740975 1.523679446 0
47. 4 2016 9.783994572 1.524600576 0
48. 4 2017 9.796046606 1.52874394 0
49. 5 2006 9.38368694 1.115308884 0
50. 5 2007 9.474012385 1.197450585 0
51. 5 2008 9.601117888 1.147874621 0
52. 5 2009 9.70447685 1.19500342 0
53. 5 2010 9.873801644 1.156599966 0
54. 5 2011 10.03501007 1.036605624 0
55. 5 2012 10.15581199 0.931225537 0
56. 5 2013 10.02230621 0.944321114 0
57. 5 2014 9.807226496 0.944661991 0
58. 5 2015 9.847098899 1.025246199 0
59. 5 2016 9.825490049 1.084138866 0
60. 5 2017 9.910633475 1.124877358 0
61.
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. end
. dataex
----------------------- copy starting from the next line -----------------------
------------------ copy up to and including the previous line ------------------
Listed 60 out of 60 observations
.
end of do-file
如果您有什么改进的命令敬请告知,感激不尽!