Frequencies for first 10,000 rows of ekg variable in namcs2011 dataset :

    EKG/ECG |
(electrocar |
   diogram) |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,756       97.56       97.56
        Yes |        244        2.44      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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