Frequencies for first 10,000 rows of isllb10 variable in natl1989 dataset :

   Interval |
 since last |
 live birth |
  Recode 10 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,315       43.15       43.15
          1 |         87        0.87       44.02
          2 |         84        0.84       44.86
          3 |        606        6.06       50.92
          4 |        641        6.41       57.33
          5 |      1,156       11.56       68.89
          6 |        852        8.52       77.41
          7 |        606        6.06       83.47
          8 |        378        3.78       87.25
          9 |      1,117       11.17       98.42
         10 |        158        1.58      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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