Frequencies for first 10,000 rows of isllb17 variable in natl1985 dataset :

   Interval |
 since last |
 live birth |
  Recode 17 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,464       44.64       44.64
          1 |         95        0.95       45.59
          2 |         88        0.88       46.47
          4 |        258        2.58       49.05
          5 |        308        3.08       52.13
          7 |        314        3.14       55.27
          8 |        302        3.02       58.29
         10 |        603        6.03       64.32
         11 |        553        5.53       69.85
         12 |        830        8.30       78.15
         13 |        596        5.96       84.11
         14 |        429        4.29       88.40
         16 |        234        2.34       90.74
         17 |        193        1.93       92.67
         18 |        164        1.64       94.31
         19 |        137        1.37       95.68
         20 |        304        3.04       98.72
         21 |        128        1.28      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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