Frequencies for first 10,000 rows of term9 variable in natl1981 dataset :

   Interval |
      Since |
Termination |
    of Last |
  Pregnancy |
   Recode 9 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      3,822       38.22       38.22
          1 |         93        0.93       39.15
          2 |        181        1.81       40.96
          3 |        881        8.81       49.77
          4 |        752        7.52       57.29
          5 |      1,152       11.52       68.81
          6 |        728        7.28       76.09
          7 |        503        5.03       81.12
          8 |      1,199       11.99       93.11
          9 |        689        6.89      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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