Frequencies for first 10,000 rows of dtotord variable in natl1977 dataset :

Total birth |
      order |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      3,928       39.28       39.28
          2 |      2,973       29.73       69.01
          3 |      1,564       15.64       84.65
          4 |        745        7.45       92.10
          5 |        335        3.35       95.45
          6 |        181        1.81       97.26
          7 |        110        1.10       98.36
          8 |         61        0.61       98.97
          9 |         42        0.42       99.39
         10 |         28        0.28       99.67
         11 |         17        0.17       99.84
         12 |          8        0.08       99.92
         13 |          4        0.04       99.96
         15 |          1        0.01       99.97
         16 |          1        0.01       99.98
         99 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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