Frequencies for first 10,000 rows of dtotord variable in natl1971 dataset :

Total birth |
      order |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      3,951       39.51       39.51
          2 |      2,653       26.53       66.04
          3 |      1,488       14.88       80.92
          4 |        733        7.33       88.25
          5 |        423        4.23       92.48
          6 |        248        2.48       94.96
          7 |        148        1.48       96.44
          8 |         98        0.98       97.42
          9 |         84        0.84       98.26
         10 |         39        0.39       98.65
         11 |         34        0.34       98.99
         12 |         21        0.21       99.20
         13 |         15        0.15       99.35
         14 |          6        0.06       99.41
         15 |          8        0.08       99.49
         18 |          4        0.04       99.53
         19 |          3        0.03       99.56
         99 |         44        0.44      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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