Frequencies for first 10,000 rows of dtotord variable in natl1979 dataset :

Total birth |
      order |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      3,843       38.43       38.43
          2 |      3,095       30.95       69.38
          3 |      1,640       16.40       85.78
          4 |        726        7.26       93.04
          5 |        318        3.18       96.22
          6 |        164        1.64       97.86
          7 |         79        0.79       98.65
          8 |         55        0.55       99.20
          9 |         20        0.20       99.40
         10 |         24        0.24       99.64
         11 |         11        0.11       99.75
         12 |          8        0.08       99.83
         13 |          5        0.05       99.88
         14 |          1        0.01       99.89
         15 |          2        0.02       99.91
         16 |          1        0.01       99.92
         18 |          2        0.02       99.94
         19 |          1        0.01       99.95
         99 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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