Frequencies for first 10,000 rows of ekg variable in namcs2014 dataset :

    EKG/ECG |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,643       96.43       96.43
        Yes |        357        3.57      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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