Frequencies for first 10,000 rows of isllb17 variable in natl1982 dataset :

   Interval |
 since last |
 live birth |
  Recode 17 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,321       43.21       43.21
          1 |         90        0.90       44.11
          2 |         85        0.85       44.96
          4 |        279        2.79       47.75
          5 |        351        3.51       51.26
          7 |        379        3.79       55.05
          8 |        338        3.38       58.43
         10 |        644        6.44       64.87
         11 |        589        5.89       70.76
         12 |        767        7.67       78.43
         13 |        551        5.51       83.94
         14 |        389        3.89       87.83
         16 |        297        2.97       90.80
         17 |        253        2.53       93.33
         18 |        168        1.68       95.01
         19 |        136        1.36       96.37
         20 |        290        2.90       99.27
         21 |         73        0.73      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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