Frequencies for first 10,000 rows of isllb10 variable in natl1990 dataset :

   Interval |
 since last |
 live birth |
  Recode 10 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,318       43.18       43.18
          1 |        107        1.07       44.25
          2 |         93        0.93       45.18
          3 |        706        7.06       52.24
          4 |        697        6.97       59.21
          5 |      1,151       11.51       70.72
          6 |        810        8.10       78.82
          7 |        568        5.68       84.50
          8 |        357        3.57       88.07
          9 |      1,051       10.51       98.58
         10 |        142        1.42      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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