re: st: pseudo random orders for treatment levels

[David Airey <david.airey@vanderbilt.edu>]

Here is example data that I want randomized/reordered by within period. 
What simple trick am I missing?

. set obs 40
obs was 0, now 40
. gen index = _n
. egen period = seq(), from(1) to(4) block(10)
. egen order = seq(), from(1) to(5) block(2)


     +------------------------+
     | index   period   order |
     |------------------------|
  1. |     1        1       1 |
  2. |     2        1       1 |
  3. |     3        1       2 |
  4. |     4        1       2 |
  5. |     5        1       3 |
     |------------------------|
  6. |     6        1       3 |
  7. |     7        1       4 |
  8. |     8        1       4 |
  9. |     9        1       5 |
 10. |    10        1       5 |
     |------------------------|
 11. |    11        2       1 |
 12. |    12        2       1 |
 13. |    13        2       2 |
 14. |    14        2       2 |
 15. |    15        2       3 |
     |------------------------|
 16. |    16        2       3 |
 17. |    17        2       4 |
 18. |    18        2       4 |
 19. |    19        2       5 |
 20. |    20        2       5 |
     |------------------------|
 21. |    21        3       1 |
 22. |    22        3       1 |
 23. |    23        3       2 |
 24. |    24        3       2 |
 25. |    25        3       3 |
     |------------------------|
 26. |    26        3       3 |
 27. |    27        3       4 |
 28. |    28        3       4 |
 29. |    29        3       5 |
 30. |    30        3       5 |
     |------------------------|
 31. |    31        4       1 |
 32. |    32        4       1 |
 33. |    33        4       2 |
 34. |    34        4       2 |
 35. |    35        4       3 |
     |------------------------|
 36. |    36        4       3 |
 37. |    37        4       4 |
 38. |    38        4       4 |
 39. |    39        4       5 |
 40. |    40        4       5 |
     +------------------------+

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