Frequencies for first 10,000 rows of tbo variable in natlterr2003 dataset :

Total Birth |
  Order U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      4,068       40.68       40.68
          2 |      3,106       31.06       71.74
          3 |      1,670       16.70       88.44
          4 |        669        6.69       95.13
          5 |        263        2.63       97.76
          6 |        120        1.20       98.96
          7 |         47        0.47       99.43
          8 |         31        0.31       99.74
          9 |         10        0.10       99.84
         10 |          6        0.06       99.90
         11 |          5        0.05       99.95
         12 |          2        0.02       99.97
         13 |          2        0.02       99.99
         14 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015