stata 低频数据转高频（季度转日度）如何实现?

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我下载的个股财务杠杆和账面市值比都是季度的数据，想转为日度数据，请问如何实现呢？

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1. * Example generated by -dataex-. To install: ssc install dataex
   
2. clear
   
3. input str6 Stkcd float(Date LEV BM)
   
4. "000002" 21457 1.146224  .964731
   
5. "000002" 21549  1.08892  .982434
   
6. "000002" 21639 1.313664  .937771
   
7. "000002" 21730  1.11641  .950663
   
8. "000002" 21822 1.115368  .971616
   
9. "000002" 21914 1.074941  .948919
   
10. "000002" 22005 1.471233  .991006
    
11. "000002" 22096 1.125107  .993164
    
12. "000002" 22188 1.114664  .987544
    
13. "000002" 22280 1.064576  1.00886
    
14. "000002" 22370  1.38672  1.00363
    
15. "000063" 16982 1.111947  .566728
    
16. "000063" 17074  1.19291  .538784
    
17. "000063" 17166 1.224021  .496556
    
18. "000063" 17256 2.346933  .482847
    
19. "000063" 17347 1.311644  .469436
    
20. "000063" 17439 1.294167  .460933
    
21. "000063" 17531 1.286138  .448222
    
22. "000063" 17622 2.074913  .488662
    
23. "000063" 17713 1.462651   .49645
    
24. "000063" 17805 1.703219  .645302
    
25. "000063" 17897 1.578223   .70431
    
26. "000063" 17987 3.381124  .628543
    
27. "000063" 18078 1.303297   .65047
    
28. "000063" 18170  1.29662  .527079
    
29. "000063" 18262 1.236026  .515536
    
30. "000063" 18352 2.225113  .534488
    
31. "000063" 18443 1.531737  .690516
    
32. "000063" 18535 1.306154  .612668
    
33. "000063" 18627 1.274867   .61223
    
34. "000063" 18717 1.583779  .596463
    
35. "000063" 18808 1.346089  .631535
    
36. "000063" 18900 1.924224  .715838
    
37. "000063" 18992 1.894193  .767896
    
38. "000063" 19083 1.363138  .774968
    
39. "000063" 19174 2.267575  .833798
    
40. "000063" 19358        .  .907882
    
41. "000063" 19448 3.165516  .865495
    
42. "000063" 19539 2.943369  .829494
    
43. "000063" 19631 2.826073  .746139
    
44. "000063" 19723 2.346014  .824497
    
45. "000063" 19813 1.268961  .843532
    
46. "000063" 19904 1.308987  .833992
    
47. "000063" 19996 1.534647  .793991
    
48. "000063" 20088 1.593795  .747968
    
49. "000063" 20178 1.720235  .735033
    
50. "000063" 20269 1.470084  .712331
    
51. "000063" 20361 1.335871  .804005
    
52. "000063" 20453  1.33247  .780592
    
53. "000063" 20544 1.111316  .875685
    
54. "000063" 20635  .964895  .892557
    
55. "000063" 20727 1.033625  .893447
    
56. "000063" 20819        .  .845614
    
57. "000063" 20909  .990943  .828324
    
58. "000063" 21000 1.087959  .719885
    
59. "000063" 21092 1.112349  .664977
    
60. "000063" 21184 1.155305  .573492
    
61. "000063" 21365        .  .852277
    
62. "000063" 21549        .  .724555
    
63. "000063" 21639 1.560336  .610006
    
64. "000063" 21730 1.296231  .578441
    
65. "000063" 21822 1.092868  .602768
    
66. "000063" 21914 1.134878   .55842
    
67. "000063" 22005 1.870895  .487269
    
68. "000063" 22096 1.222752  .540112
    
69. "000063" 22188 1.173519  .604899
    
70. "000063" 22280 1.083042  .579913
    
71. "000063" 22370 1.149438  .641938
    
72. "000066" 16982  .972822  .650691
    
73. "000066" 17074  .968294  .711033
    
74. "000066" 17166  .938979  .727992
    
75. "000066" 17256  .965674  .527378
    
76. "000066" 17347  1.01471  .535085
    
77. "000066" 17439 1.094212  .434683
    
78. "000066" 17531 1.212695  .461073
    
79. "000066" 17622 5.104902  .574584
    
80. "000066" 17713 1.671842  .835362
    
81. "000066" 17805 2.661818  .951487
    
82. "000066" 17897 5.615477  .797973
    
83. "000066" 17987 1.468755  .633396
    
84. "000066" 18078 1.196008  .509399
    
85. "000066" 18170 1.173138  .547582
    
86. "000066" 18262 1.159464  .977657
    
87. "000066" 18352 1.258292  .986353
    
88. "000066" 18443 1.414269  1.03674
    
89. "000066" 18535  .966281  .951801
    
90. "000066" 18627  .986344  .941281
    
91. "000066" 18717  .484187  .967756
    
92. "000066" 18808   .33182 1.043311
    
93. "000066" 18900   .94867 1.091419
    
94. "000066" 18992 1.109036 1.124992
    
95. "000066" 19083  .225103 1.154963
    
96. "000066" 19174  3.43508 1.157313
    
97. "000066" 19266 1.803335 1.145658
    
98. "000066" 19358 2.582588 1.174611
    
99. "000066" 19448        . 1.180134
    
100. "000066" 19539        . 1.170781
     
101. "000066" 19631        . 1.090976
     
102. "000066" 19723        . 1.103269
     
103. "000066" 19904        . 1.064006
     
104. end
     
105. format %tdCCYY-NN-DD Date

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