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  • #1

    Simple Random Sampling Without Replacement

    I have a dataset where I want to allocate 80 % of the sample drawn to Person A and the Rest 20 % is to both Person A and B. Could anyone please help me with which command to use and how to create two different datasets for persons A and B with the criteria?

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  • #2
    I will assume that you want to draw 80% of the observations and create a dataset and thereafter do a second drawing from the remaining 20%. Do you allocate the same number of observations to A and B in the second drawing? If so, how is that different from drawing 90% of the observations for A and the remaining 10% for B?

    Code:
    clear
set obs 100
set seed 06202022
gen sample= runiformint(1, 100)
list, sep(0)
*START HERE
gen random= rnormal()
*ALLOCATION: 90% TO A
sort random
frame put sample in 1/`=int(0.9*`=_N')', into(A)
frame put sample in `=int(0.9*`=_N') +1'/ l, into(B)
frame A: list, sep(0)
frame B: list, sep(0)
    Res.:

    Code:
    . list, sep(0)

     +--------+
     | sample |
     |--------|
  1. |      2 |
  2. |     46 |
  3. |     15 |
  4. |     50 |
  5. |     79 |
  6. |     82 |
  7. |     50 |
  8. |     38 |
  9. |     21 |
 10. |     96 |
 11. |     51 |
 12. |     17 |
 13. |     12 |
 14. |     77 |
 15. |     15 |
 16. |     43 |
 17. |     14 |
 18. |     59 |
 19. |     12 |
 20. |     57 |
 21. |     28 |
 22. |     55 |
 23. |     30 |
 24. |     70 |
 25. |     55 |
 26. |     36 |
 27. |     20 |
 28. |      6 |
 29. |     28 |
 30. |     52 |
 31. |    100 |
 32. |     98 |
 33. |      2 |
 34. |     36 |
 35. |     24 |
 36. |     83 |
 37. |     98 |
 38. |     64 |
 39. |     83 |
 40. |      8 |
 41. |      6 |
 42. |      1 |
 43. |     28 |
 44. |     90 |
 45. |     82 |
 46. |     89 |
 47. |     26 |
 48. |     50 |
 49. |      4 |
 50. |     17 |
 51. |     95 |
 52. |     51 |
 53. |     28 |
 54. |     92 |
 55. |     44 |
 56. |      3 |
 57. |     72 |
 58. |     53 |
 59. |     53 |
 60. |     99 |
 61. |     41 |
 62. |     19 |
 63. |     62 |
 64. |     23 |
 65. |     81 |
 66. |     43 |
 67. |     49 |
 68. |     26 |
 69. |     28 |
 70. |     47 |
 71. |     55 |
 72. |     95 |
 73. |     84 |
 74. |     27 |
 75. |     99 |
 76. |     44 |
 77. |     78 |
 78. |      8 |
 79. |     83 |
 80. |     74 |
 81. |     93 |
 82. |     51 |
 83. |     81 |
 84. |     22 |
 85. |     81 |
 86. |     83 |
 87. |     65 |
 88. |     16 |
 89. |     57 |
 90. |     48 |
 91. |     33 |
 92. |     89 |
 93. |     82 |
 94. |     76 |
 95. |     22 |
 96. |     37 |
 97. |     28 |
 98. |     94 |
 99. |     57 |
100. |     53 |
     +--------+

.
. *START HERE

.
. gen random= rnormal()

.
. *ALLOCATION: 90% TO A

. frame A: list, sep(0)

     +--------+
     | sample |
     |--------|
  1. |     53 |
  2. |     72 |
  3. |     82 |
  4. |     84 |
  5. |     55 |
  6. |     82 |
  7. |     28 |
  8. |     50 |
  9. |     96 |
 10. |     44 |
 11. |     83 |
 12. |      6 |
 13. |      4 |
 14. |     94 |
 15. |     81 |
 16. |    100 |
 17. |      8 |
 18. |     14 |
 19. |     57 |
 20. |     19 |
 21. |     48 |
 22. |     28 |
 23. |     77 |
 24. |     28 |
 25. |      6 |
 26. |     28 |
 27. |     81 |
 28. |     24 |
 29. |     22 |
 30. |     26 |
 31. |     22 |
 32. |     55 |
 33. |     44 |
 34. |     38 |
 35. |      2 |
 36. |     51 |
 37. |     98 |
 38. |     89 |
 39. |      3 |
 40. |     17 |
 41. |     52 |
 42. |     64 |
 43. |     50 |
 44. |     65 |
 45. |     93 |
 46. |     43 |
 47. |     89 |
 48. |     33 |
 49. |     83 |
 50. |     26 |
 51. |     82 |
 52. |     12 |
 53. |     81 |
 54. |     23 |
 55. |     37 |
 56. |     16 |
 57. |     57 |
 58. |      8 |
 59. |     53 |
 60. |     90 |
 61. |     50 |
 62. |     95 |
 63. |     55 |
 64. |     17 |
 65. |     46 |
 66. |     21 |
 67. |     15 |
 68. |     74 |
 69. |     99 |
 70. |     83 |
 71. |     28 |
 72. |     98 |
 73. |     57 |
 74. |     78 |
 75. |      1 |
 76. |     99 |
 77. |     49 |
 78. |     20 |
 79. |     12 |
 80. |     51 |
 81. |     41 |
 82. |     36 |
 83. |     95 |
 84. |     47 |
 85. |     36 |
 86. |     70 |
 87. |     27 |
 88. |     30 |
 89. |     62 |
 90. |     92 |
     +--------+

. 
. frame B: list, sep(0)

     +--------+
     | sample |
     |--------|
  1. |     15 |
  2. |     59 |
  3. |     76 |
  4. |     79 |
  5. |     83 |
  6. |     43 |
  7. |      2 |
  8. |     51 |
  9. |     28 |
 10. |     53 |
     +--------+

.
    Last edited by Andrew Musau; 20 Jun 2022, 08:06.
    • 1 like

    Comment

    • #3
      Thank you! It was very helpful.

      Comment

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