Frequencies for first 10,000 rows of abg variable in nhamcsed2010 dataset :

   Arterial |
Blood Gases |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,496       94.96       94.96
        yes |        504        5.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016