Frequencies for first 10,000 rows of isllb10 variable in natl1985 dataset :

   Interval |
 since last |
 live birth |
  Recode 10 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,464       44.64       44.64
          1 |         95        0.95       45.59
          2 |         88        0.88       46.47
          3 |        566        5.66       52.13
          4 |        616        6.16       58.29
          5 |      1,156       11.56       69.85
          6 |        830        8.30       78.15
          7 |        596        5.96       84.11
          8 |        429        4.29       88.40
          9 |      1,032       10.32       98.72
         10 |        128        1.28      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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