Frequencies for first 10,000 rows of omaps variable in natl1991 dataset :

 One Minute |
Apgar Score |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          6        0.06        0.06
          1 |         48        0.48        0.54
          2 |         58        0.58        1.12
          3 |         74        0.74        1.86
          4 |         93        0.93        2.79
          5 |        134        1.34        4.13
          6 |        266        2.66        6.79
          7 |        682        6.82       13.61
          8 |      3,894       38.94       52.55
          9 |      4,542       45.42       97.97
         10 |        156        1.56       99.53
         99 |         47        0.47      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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