Frequencies for first 10,000 rows of nlbnd variable in natl1975 dataset :

 Born alive |
 - now dead |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,568       95.68       95.68
          1 |        354        3.54       99.22
          2 |         38        0.38       99.60
          3 |         10        0.10       99.70
          4 |          1        0.01       99.71
         55 |          1        0.01       99.72
         77 |         25        0.25       99.97
         99 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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