Frequencies for first 10,000 rows of term9 variable in natl1978 dataset :

   Interval |
      Since |
Termination |
    of Last |
  Pregnancy |
   Recode 9 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      3,860       38.60       38.60
          1 |         89        0.89       39.49
          2 |        156        1.56       41.05
          3 |        819        8.19       49.24
          4 |        639        6.39       55.63
          5 |      1,147       11.47       67.10
          6 |        886        8.86       75.96
          7 |        564        5.64       81.60
          8 |      1,313       13.13       94.73
          9 |        527        5.27      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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