Frequencies for first 10,000 rows of isllb8 variable in natl1985 dataset :

   Interval |
 since last |
 live birth |
   Recode 8 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,464       44.64       44.64
          1 |         95        0.95       45.59
          2 |         88        0.88       46.47
          3 |      1,182       11.82       58.29
          4 |      1,156       11.56       69.85
          5 |        830        8.30       78.15
          6 |      1,025       10.25       88.40
          7 |      1,032       10.32       98.72
          8 |        128        1.28      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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