Frequencies for first 10,000 rows of dtotord variable in natl1987 dataset :

Total birth |
      order |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      3,838       38.38       38.38
          2 |      3,092       30.92       69.30
          3 |      1,727       17.27       86.57
          4 |        759        7.59       94.16
          5 |        317        3.17       97.33
          6 |        119        1.19       98.52
          7 |         58        0.58       99.10
          8 |         46        0.46       99.56
          9 |         17        0.17       99.73
         10 |          7        0.07       99.80
         11 |          7        0.07       99.87
         12 |          1        0.01       99.88
         14 |          1        0.01       99.89
         15 |          1        0.01       99.90
         18 |          1        0.01       99.91
         21 |          1        0.01       99.92
         99 |          8        0.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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