stata数据处理，谢谢解答~

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最终想得到的结果是，以第一个id 22的vol为被解释变量y，以第二个id 153 和第三个id 521的vol为解释变量x1 和 x2做多元回归。其中，三个变量的date不同，需选取公共时间。谢谢解答~

1. * Example generated by -dataex-. To install: ssc install dataex
   
2. clear
   
3. input int id str10 date float vol
   
4. 22 "2016-03-21" .052813
   
5. 22 "2016-03-22" .052454
   
6. 22 "2016-03-23" .052408
   
7. 22 "2016-03-24" .047639
   
8. 22 "2016-03-25"  .04712
   
9. 22 "2016-03-28" .045522
   
10. 22 "2016-03-29" .044819
    
11. 22 "2016-03-30" .043843
    
12. 22 "2016-03-31" .043505
    
13. 22 "2016-04-01" .037377
    
14. 22 "2016-04-05" .034572
    
15. 22 "2016-04-06" .031845
    
16. 22 "2016-04-07"  .02941
    
17. 22 "2016-04-08" .029335
    
18. 22 "2016-04-11" .028991
    
19. 22 "2016-04-12" .024011
    
20. 22 "2016-04-13" .024352
    
21. 22 "2016-04-14" .022763
    
22. 22 "2016-04-15" .021754
    
23. 22 "2016-04-18" .020897
    
24. 22 "2016-04-19" .020582
    
25. 22 "2016-04-20" .024134
    
26. 22 "2016-04-21"  .02426
    
27. 22 "2016-04-22" .023183
    
28. 22 "2016-04-25" .023225
    
29. 22 "2016-04-26" .023121
    
30. 22 "2016-04-27" .022679
    
31. 22 "2016-04-28" .021752
    
32. 22 "2016-04-29" .021645
    
33. 153 "2016-04-22"  .04837
    
34. 153 "2016-04-25" .050336
    
35. 153 "2016-04-26" .050088
    
36. 153 "2016-04-27" .043589
    
37. 153 "2016-04-28" .042855
    
38. 153 "2016-04-29" .037977
    
39. 521 "2016-03-30" .037602
    
40. 521 "2016-03-31"  .03761
    
41. 521 "2016-04-01" .037194
    
42. 521 "2016-04-05"     .03
    
43. 521 "2016-04-06" .027106
    
44. 521 "2016-04-07" .023832
    
45. 521 "2016-04-08"  .02347
    
46. 521 "2016-04-11" .023977
    
47. 521 "2016-04-12"  .02307
    
48. 521 "2016-04-13" .022991
    
49. 521 "2016-04-14" .022344
    
50. 521 "2016-04-15"  .02168
    
51. 521 "2016-04-18" .020972
    
52. 521 "2016-04-19" .021193
    
53. 521 "2016-04-20" .020905
    
54. 521 "2016-04-21" .020619
    
55. 521 "2016-04-22" .019372
    
56. 521 "2016-04-25" .020068
    
57. 521 "2016-04-26"  .02062
    
58. 521 "2016-04-27" .019568
    
59. 521 "2016-04-28" .018638
    
60. 521 "2016-04-29" .019036
    
61. end

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