Frequencies for first 10,000 rows of abg variable in nhamcsed2014 dataset :

   Arterial |
blood gases |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,713       97.13       97.13
        Yes |        287        2.87      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 11 Apr 2017