Frequencies for first 10,000 rows of nlbnd variable in natl1978 dataset :

 Born alive |
 - now dead |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,702       97.02       97.02
          1 |        259        2.59       99.61
          2 |         31        0.31       99.92
          3 |          3        0.03       99.95
          4 |          2        0.02       99.97
         99 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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