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[数据管理求助] DID如何将post变量设为大于eventdate的为1，小于eventdate的为0 [推广有奖]

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babyfacy90 发表于 2020-8-26 14:24:28 |AI写论文

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  1. * Example generated by -dataex-. To install: ssc install dataex
  2. clear
  3. input long stkcd int date str12 stknme double(rit turnover) int eventdate
  4. 8 21403 "神州高铁" -.100806 .22259999811649323 71
  5. 8 21404 "神州高铁" -.100897  .4514000117778778 71
  6. 8 21405 "神州高铁"    .0399  7.200300216674805 71
  7. 8 21406 "神州高铁" -.052758 2.8796000480651855 71
  8. 8 21409 "神州高铁" -.017722 1.4937000274658203 71
  9. 8 21410 "神州高铁"        0  1.341599941253662 71
  10. 8 21411 "神州高铁" -.030928 1.3042999505996704 71
  11. 8 21412 "神州高铁" -.015957  .7315000295639038 71
  12. 8 21413 "神州高铁" -.018919  .5906000137329102 71
  13. 8 21416 "神州高铁"  .011019  .7851999998092651 71
  14. 8 21417 "神州高铁"  .010899  .6265000104904175 71
  15. 8 21418 "神州高铁" -.002695  .6388999819755554 71
  16. 8 21419 "神州高铁"  .002703  .5784000158309937 71
  17. 8 21420 "神州高铁"  .040431  1.441499948501587 71
  18. 8 21423 "神州高铁"  .010363 1.5820000171661377 71
  19. 8 21424 "神州高铁" -.005128 1.6174999475479126 71
  20. 8 21425 "神州高铁"  .005155  .5656999945640564 71
  21. 8 21426 "神州高铁"        0  .7847999930381775 71
  22. 8 21427 "神州高铁"        0  .6523000001907349 71
  23. 8 21430 "神州高铁"  .082051  2.466200113296509 71
  24. 8 21431 "神州高铁"  .004739 1.7562999725341797 71
  25. 8 21432 "神州高铁"  .014151 1.6721999645233154 71
  26. 8 21433 "神州高铁"  .074419  3.148400068283081 71
  27. 8 21434 "神州高铁"   .02381  2.690500020980835 71
  28. 8 21437 "神州高铁" -.014799  2.950000047683716 71
  29. 8 21438 "神州高铁" -.019313 1.5441999435424805 71
  30. 8 21439 "神州高铁"  .004376  .6417999863624573 71
  31. 8 21440 "神州高铁" -.006536   .760699987411499 71
  32. 8 21441 "神州高铁"        0  .5450000166893005 71
  33. 8 21444 "神州高铁"  .002193  .5299000144004822 71
  34. 8 21445 "神州高铁"  .028446  .8300999999046326 71
  35. 8 21446 "神州高铁" -.014894 1.9961999654769897 71
  36. 8 21447 "神州高铁" -.008639  1.232200026512146 71
  37. 8 21448 "神州高铁" -.004357  .6166999936103821 71
  38. 8 21452 "神州高铁" -.002188  .4562999904155731 71
  39. 8 21453 "神州高铁" -.006579  .4973999857902527 71
  40. 8 21454 "神州高铁" -.028698  1.270799994468689 71
  41. 8 21455 "神州高铁"        0  1.107200026512146 71
  42. 8 21465 "神州高铁"        0  .8245999813079834 71
  43. 8 21466 "神州高铁" -.004545  .7958999872207642 71
  44. 8 21467 "神州高铁" -.002283  .6474000215530396 71
  45. 8 21468 "神州高铁" -.059497  1.430299997329712 71
  46. 8 21469 "神州高铁" -.036496 1.8381999731063843 71
  47. 8 21472 "神州高铁" -.027778 1.1949000358581543 71
  48. 8 21473 "神州高铁" -.080519 3.8691999912261963 71
  49. 8 21474 "神州高铁"  .039548  2.377700090408325 71
  50. 8 21475 "神州高铁" -.027174 1.8942999839782715 71
  51. 8 21476 "神州高铁"  .094972 2.6535000801086426 71
  52. 8 21479 "神州高铁"  .022959  2.842900037765503 71
  53. 8 21480 "神州高铁"  .007481  1.567199945449829 71
  54. 8 21481 "神州高铁"  .007426 1.4414000511169434 71
  55. 8 21482 "神州高铁"   .02457 1.7388999462127686 71
  56. 8 21483 "神州高铁"  .019185 1.4510999917984009 71
  57. 8 21486 "神州高铁" -.009412  1.419100046157837 71
  58. 8 21487 "神州高铁"  .021378 1.4723999500274658 71
  59. 8 21488 "神州高铁"  .025581 1.3746999502182007 71
  60. 8 21489 "神州高铁" -.013605 1.7171000242233276 71
  61. 8 21490 "神州高铁"  .004598  1.479699969291687 71
  62. 8 21493 "神州高铁"  .034325  1.881700038909912 71
  63. 8 21494 "神州高铁" -.019912  1.773300051689148 71
  64. 8 21500 "神州高铁" -.047404  5.969900131225586 71
  65. 8 21501 "神州高铁"  .018957 2.3717000484466553 71
  66. 8 21502 "神州高铁" -.018605 1.3286000490188599 71
  67. 8 21503 "神州高铁"   .00237 1.3115999698638916 71
  68. 8 21504 "神州高铁" -.004728 1.2958999872207642 71
  69. 8 21507 "神州高铁" -.009501 1.2217999696731567 71
  70. 8 21508 "神州高铁" -.033573 1.4500999450683594 71
  71. 8 21509 "神州高铁"  .049628  2.010999917984009 71
  72. 8 21510 "神州高铁" -.009456 1.1589000225067139 71
  73. 8 21511 "神州高铁" -.033413  .8450999855995178 71
  74. 8 21514 "神州高铁" -.022222  .5608000159263611 71
  75. 8 21515 "神州高铁"  .005051   .427700012922287 71
  76. 8 21516 "神州高铁"  .002513  .5142999887466431 71
  77. 8 21517 "神州高铁" -.050125 1.5149999856948853 71
  78. 8 21518 "神州高铁" -.007916  .6998999714851379 71
  79. 8 21521 "神州高铁"  .055851 1.2913000583648682 71
  80. 8 21522 "神州高铁"  .007557  .7440000176429749 71
  81. 8 21523 "神州高铁"   -.0075  .5947999954223633 71
  82. 8 21524 "神州高铁" -.015113  .5062000155448914 71
  83. 8 21525 "神州高铁"  .002558 .45590001344680786 71
  84. 8 21528 "神州高铁"  -.02551  .5245000123977661 71
  85. 8 21529 "神州高铁"  .013089 .32280001044273376 71
  86. 8 21530 "神州高铁"  .002584 .29409998655319214 71
  87. 8 21531 "神州高铁"  .056701 1.7698999643325806 71
  88. 8 21532 "神州高铁" -.031707  1.030400037765503 71
  89. 8 21535 "神州高铁" -.015113  .6884999871253967 71
  90. 8 21536 "神州高铁" -.007673  .5952000021934509 71
  91. 8 21537 "神州高铁" -.015464 .41530001163482666 71
  92. 8 21538 "神州高铁"  .002618   .424699991941452 71
  93. 8 21539 "神州高铁"  .005222  .4571000039577484 71
  94. 8 21542 "神州高铁"  .028571 1.0571000576019287 71
  95. 8 21543 "神州高铁"  .002525  .9178000092506409 71
  96. 8 21544 "神州高铁"  .002519  .9513000249862671 71
  97. 8 21545 "神州高铁" -.022613    .65829998254776 71
  98. 8 21546 "神州高铁"        0  .3817000091075897 71
  99. 8 21551 "神州高铁" -.002571 .35850000381469727 71
  100. 8 21552 "神州高铁" -.010309 .41280001401901245 71
  101. 8 21553 "神州高铁"  .018229   .689300000667572 71
  102. 8 21556 "神州高铁"  .040921 1.5822999477386475 71
  103. 8 21557 "神州高铁"  .017199 1.7589000463485718 71
  104. end
  105. format %tdCCYY-NN-DD date
  106. format %tdCCYY-NN-DD eventdate
  107. label values eventdate daten
  108. label def daten 71 "2018-12-25", modify
复制代码

------------------ copy up to and including the previous line ------------------

Listed 100 out of 98558 observations

. gen post =0

. replace post =1 if date >=eventdate
(98,558 real changes made)

.
end of do-file
双重差分分析生成post ，将date 大于等于eventdate的post设为1，否则为0。求大神指教以下指令有什么问题，为什么全部post都变为1呢？
gen post =0

. replace post =1 if date >=eventdate
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关键词：Event date Even vent post stata did

相关帖子

沙发
黃河泉 在职认证  发表于 2020-8-26 16:30:25
关键在于你的 eventdate 变量不是标准的时间变量，请试试
  1. decode eventdate, gen(ymd)
  2. gen event = date(ymd, "YMD")
  3. format event %td
  4. gen post = 0
  5. replace post =1 if date >= event
复制代码
藤椅
babyfacy90 发表于 2020-8-26 16:41:53
黃河泉 发表于 2020-8-26 16:30
关键在于你的 eventdate 变量不是标准的时间变量，请试试
[em23]黄老师，感谢感谢！！
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