Frequencies for first 10,000 rows of ekg variable in namcs2013 dataset :

    EKG/ECG |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,759       97.59       97.59
        Yes |        241        2.41      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017