Frequencies for first 10,000 rows of isllb8 variable in natl1988 dataset :

   Interval |
 since last |
 live birth |
   Recode 8 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,397       43.97       43.97
          1 |        119        1.19       45.16
          2 |         84        0.84       46.00
          3 |      1,316       13.16       59.16
          4 |      1,138       11.38       70.54
          5 |        744        7.44       77.98
          6 |        975        9.75       87.73
          7 |      1,107       11.07       98.80
          8 |        120        1.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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