Frequencies for first 10,000 rows of isllb10 variable in natl1991 dataset :

   Interval |
 since last |
 live birth |
  Recode 10 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,306       43.06       43.06
          1 |        118        1.18       44.24
          2 |         86        0.86       45.10
          3 |        677        6.77       51.87
          4 |        738        7.38       59.25
          5 |      1,134       11.34       70.59
          6 |        864        8.64       79.23
          7 |        563        5.63       84.86
          8 |        427        4.27       89.13
          9 |      1,062       10.62       99.75
         10 |         25        0.25      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015