Frequencies for first 10,000 rows of omaps variable in natl1990 dataset :

 One Minute |
Apgar Score |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          3        0.03        0.03
          1 |         47        0.47        0.50
          2 |         49        0.49        0.99
          3 |         74        0.74        1.73
          4 |         83        0.83        2.56
          5 |        158        1.58        4.14
          6 |        256        2.56        6.70
          7 |        744        7.44       14.14
          8 |      3,964       39.64       53.78
          9 |      4,389       43.89       97.67
         10 |        156        1.56       99.23
         99 |         77        0.77      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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