Frequencies for first 10,000 rows of isllb8 variable in natl1982 dataset :

   Interval |
 since last |
 live birth |
   Recode 8 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,321       43.21       43.21
          1 |         90        0.90       44.11
          2 |         85        0.85       44.96
          3 |      1,347       13.47       58.43
          4 |      1,233       12.33       70.76
          5 |        767        7.67       78.43
          6 |        940        9.40       87.83
          7 |      1,144       11.44       99.27
          8 |         73        0.73      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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