Frequencies for first 10,000 rows of dtotord variable in natl1970 dataset :

Total birth |
      order |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      3,984       39.84       39.84
          2 |      2,574       25.74       65.58
          3 |      1,417       14.17       79.75
          4 |        785        7.85       87.60
          5 |        431        4.31       91.91
          6 |        235        2.35       94.26
          7 |        152        1.52       95.78
          8 |        115        1.15       96.93
          9 |         88        0.88       97.81
         10 |         61        0.61       98.42
         11 |         40        0.40       98.82
         12 |         24        0.24       99.06
         13 |         23        0.23       99.29
         14 |         15        0.15       99.44
         15 |          7        0.07       99.51
         16 |          1        0.01       99.52
         17 |          2        0.02       99.54
         18 |          3        0.03       99.57
         99 |         43        0.43      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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