Frequencies for first 10,000 rows of disllb variable in natl1994 dataset :

   Interval |
 since last |
 live birth |
   (dropped |
   1994 but |
   still in |
   PDF doc) |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |     10,000      100.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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