Frequencies for first 10,000 rows of dtotord variable in natl1985 dataset :

Total birth |
      order |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      3,857       38.57       38.57
          2 |      3,106       31.06       69.63
          3 |      1,699       16.99       86.62
          4 |        707        7.07       93.69
          5 |        351        3.51       97.20
          6 |        130        1.30       98.50
          7 |         66        0.66       99.16
          8 |         31        0.31       99.47
          9 |         16        0.16       99.63
         10 |         11        0.11       99.74
         11 |          6        0.06       99.80
         12 |          4        0.04       99.84
         13 |          2        0.02       99.86
         14 |          3        0.03       99.89
         18 |          1        0.01       99.90
         99 |         10        0.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 Jan 2016