Frequencies for first 10,000 rows of isllb10 variable in natl1981 dataset :

   Interval |
 since last |
 live birth |
  Recode 10 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,400       44.00       44.00
          1 |        100        1.00       45.00
          2 |         95        0.95       45.95
          3 |        643        6.43       52.38
          4 |        672        6.72       59.10
          5 |      1,162       11.62       70.72
          6 |        819        8.19       78.91
          7 |        540        5.40       84.31
          8 |        367        3.67       87.98
          9 |      1,096       10.96       98.94
         10 |        106        1.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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