Frequencies for first 10,000 rows of dtotord variable in natl1981 dataset :

Total birth |
      order |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      3,822       38.22       38.22
          2 |      3,033       30.33       68.55
          3 |      1,645       16.45       85.00
          4 |        766        7.66       92.66
          5 |        365        3.65       96.31
          6 |        159        1.59       97.90
          7 |         89        0.89       98.79
          8 |         49        0.49       99.28
          9 |         19        0.19       99.47
         10 |         23        0.23       99.70
         11 |         11        0.11       99.81
         12 |          6        0.06       99.87
         13 |          4        0.04       99.91
         14 |          1        0.01       99.92
         16 |          1        0.01       99.93
         21 |          1        0.01       99.94
         22 |          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