Frequencies for first 10,000 rows of dtotord variable in natl1980 dataset :

Total birth |
      order |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      3,817       38.17       38.17
          2 |      3,101       31.01       69.18
          3 |      1,652       16.52       85.70
          4 |        748        7.48       93.18
          5 |        329        3.29       96.47
          6 |        152        1.52       97.99
          7 |         82        0.82       98.81
          8 |         40        0.40       99.21
          9 |         31        0.31       99.52
         10 |         16        0.16       99.68
         11 |          8        0.08       99.76
         12 |          6        0.06       99.82
         13 |          3        0.03       99.85
         14 |          4        0.04       99.89
         15 |          3        0.03       99.92
         16 |          1        0.01       99.93
         17 |          1        0.01       99.94
         18 |          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