Frequencies for first 10,000 rows of isllb8 variable in natl1986 dataset :

   Interval |
 since last |
 live birth |
   Recode 8 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,352       43.52       43.52
          1 |         81        0.81       44.33
          2 |        102        1.02       45.35
          3 |      1,285       12.85       58.20
          4 |      1,155       11.55       69.75
          5 |        829        8.29       78.04
          6 |      1,008       10.08       88.12
          7 |      1,107       11.07       99.19
          8 |         81        0.81      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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