Frequencies for first 10,000 rows of isllb10 variable in natl1983 dataset :

   Interval |
 since last |
 live birth |
  Recode 10 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,344       43.44       43.44
          1 |        110        1.10       44.54
          2 |         86        0.86       45.40
          3 |        686        6.86       52.26
          4 |        645        6.45       58.71
          5 |      1,184       11.84       70.55
          6 |        897        8.97       79.52
          7 |        576        5.76       85.28
          8 |        370        3.70       88.98
          9 |      1,016       10.16       99.14
         10 |         86        0.86      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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