Frequencies for first 10,000 rows of omaps variable in linkco1991us_num dataset :

 One Minute |
Apgar Score |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        176        1.76        1.76
          1 |      1,424       14.24       16.00
          2 |        628        6.28       22.28
          3 |        431        4.31       26.59
          4 |        327        3.27       29.86
          5 |        265        2.65       32.51
          6 |        268        2.68       35.19
          7 |        330        3.30       38.49
          8 |        905        9.05       47.54
          9 |        634        6.34       53.88
         10 |         13        0.13       54.01
         99 |      4,599       45.99      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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