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

    EKG/ECG |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      8,153       81.53       81.53
        Yes |      1,847       18.47      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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