Frequencies for first 10,000 rows of isllb10 variable in natl1993 dataset :

   Interval |
 since last |
 live birth |
  Recode 10 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,425       44.25       44.25
          1 |        116        1.16       45.41
          2 |         81        0.81       46.22
          3 |        627        6.27       52.49
          4 |        756        7.56       60.05
          5 |      1,219       12.19       72.24
          6 |        797        7.97       80.21
          7 |        525        5.25       85.46
          8 |        374        3.74       89.20
          9 |      1,065       10.65       99.85
         10 |         15        0.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015