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re: st: pseudo random orders for treatment levels


From   David Airey <david.airey@vanderbilt.edu>
To   statalist@hsphsun2.harvard.edu
Subject   re: st: pseudo random orders for treatment levels
Date   Mon, 11 Aug 2003 12:54:15 -0500

Got it, finally. I missed that egen rank() can do it by().

. clear
. 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)
. gen rand = uniform()
. egen rank = rank(rand), by(period)
. list

     +------------------------------------------+
     | index   period   order       rand   rank |
     |------------------------------------------|
  1. |     1        1       1   .4481307      6 |
  2. |     2        1       1   .2635594      5 |
  3. |     3        1       2   .7811205     10 |
  4. |     4        1       2    .033332      2 |
  5. |     5        1       3   .1485784      3 |
     |------------------------------------------|
  6. |     6        1       3   .0275981      1 |
  7. |     7        1       4   .2213698      4 |
  8. |     8        1       4   .7073388      8 |
  9. |     9        1       5    .727761      9 |
 10. |    10        1       5   .5738866      7 |
     |------------------------------------------|
 11. |    11        2       1   .9036617     10 |
 12. |    12        2       1   .2007026      1 |
 13. |    13        2       2   .3221595      2 |
 14. |    14        2       2   .8862541      7 |
 15. |    15        2       3   .8474928      6 |
     |------------------------------------------|
 16. |    16        2       3    .398986      4 |
 17. |    17        2       4   .8991827      8 |
 18. |    18        2       4   .4249812      5 |
 19. |    19        2       5   .3851897      3 |
 20. |    20        2       5   .9032691      9 |
     |------------------------------------------|
 21. |    21        3       1   .7743317      8 |
 22. |    22        3       1   .7679698      7 |
 23. |    23        3       2   .5425138      5 |
 24. |    24        3       2   .8719242      9 |
 25. |    25        3       3   .5227695      4 |
     |------------------------------------------|
 26. |    26        3       3   .2102229      1 |
 27. |    27        3       4   .5534564      6 |
 28. |    28        3       4   .9088587     10 |
 29. |    29        3       5   .2769888      2 |
 30. |    30        3       5   .3915251      3 |
     |------------------------------------------|
 31. |    31        4       1   .0396565      1 |
 32. |    32        4       1   .4235426      3 |
 33. |    33        4       2   .6125947      6 |
 34. |    34        4       2   .5015944      5 |
 35. |    35        4       3   .4720692      4 |
     |------------------------------------------|
 36. |    36        4       3   .8197762      7 |
 37. |    37        4       4   .0960781      2 |
 38. |    38        4       4   .9636718     10 |
 39. |    39        4       5   .8774827      8 |
 40. |    40        4       5   .9396089      9 |
     +------------------------------------------+

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