Frequencies for first 10,000 rows of term9 variable in natl1976 dataset :

   Interval |
      Since |
Termination |
    of Last |
  Pregnancy |
   Recode 9 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,074       40.74       40.74
          1 |         83        0.83       41.57
          2 |        161        1.61       43.18
          3 |        857        8.57       51.75
          4 |        714        7.14       58.89
          5 |      1,164       11.64       70.53
          6 |        884        8.84       79.37
          7 |        576        5.76       85.13
          8 |      1,142       11.42       96.55
          9 |        345        3.45      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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