Frequencies for first 10,000 rows of term9 variable in natl1977 dataset :

   Interval |
      Since |
Termination |
    of Last |
  Pregnancy |
   Recode 9 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      3,928       39.28       39.28
          1 |         95        0.95       40.23
          2 |        157        1.57       41.80
          3 |        808        8.08       49.88
          4 |        701        7.01       56.89
          5 |      1,179       11.79       68.68
          6 |        849        8.49       77.17
          7 |        617        6.17       83.34
          8 |      1,249       12.49       95.83
          9 |        417        4.17      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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