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

    EKG/ECG |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      8,221       82.21       82.21
        yes |      1,779       17.79      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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