Frequencies for first 10,000 rows of isllb17 variable in natl1986 dataset :

   Interval |
 since last |
 live birth |
  Recode 17 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,352       43.52       43.52
          1 |         81        0.81       44.33
          2 |        102        1.02       45.35
          4 |        291        2.91       48.26
          5 |        340        3.40       51.66
          7 |        352        3.52       55.18
          8 |        302        3.02       58.20
         10 |        674        6.74       64.94
         11 |        481        4.81       69.75
         12 |        829        8.29       78.04
         13 |        594        5.94       83.98
         14 |        414        4.14       88.12
         16 |        297        2.97       91.09
         17 |        218        2.18       93.27
         18 |        154        1.54       94.81
         19 |        106        1.06       95.87
         20 |        332        3.32       99.19
         21 |         81        0.81      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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