Frequencies for first 10,000 rows of nlbnd variable in natl1974 dataset :

 Born alive |
 - now dead |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,533       95.33       95.33
          1 |        373        3.73       99.06
          2 |         43        0.43       99.49
          3 |         12        0.12       99.61
          4 |          3        0.03       99.64
          6 |          1        0.01       99.65
         55 |          3        0.03       99.68
         66 |          1        0.01       99.69
         77 |         16        0.16       99.85
         99 |         15        0.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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