Frequencies for first 10,000 rows of omaps variable in natl1987 dataset :

 One Minute |
Apgar Score |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          7        0.07        0.07
          1 |         65        0.65        0.72
          2 |         37        0.37        1.09
          3 |         75        0.75        1.84
          4 |        109        1.09        2.93
          5 |        155        1.55        4.48
          6 |        266        2.66        7.14
          7 |        724        7.24       14.38
          8 |      3,386       33.86       48.24
          9 |      4,860       48.60       96.84
         10 |        266        2.66       99.50
         99 |         50        0.50      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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