Frequencies for first 10,000 rows of ekg variable in nhamcsed2009 dataset :

    ekg/ecg |
(electrocar |
   diogram) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,243       82.43       82.43
          1 |      1,757       17.57      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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