Frequencies for first 10,000 rows of omaps variable in natl1980 dataset :

 One Minute |
Apgar Score |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          9        0.09        0.09
          1 |         52        0.52        0.61
          2 |         59        0.59        1.20
          3 |         86        0.86        2.06
          4 |        104        1.04        3.10
          5 |        186        1.86        4.96
          6 |        311        3.11        8.07
          7 |        786        7.86       15.93
          8 |      2,646       26.46       42.39
          9 |      4,958       49.58       91.97
         10 |        735        7.35       99.32
         99 |         68        0.68      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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