Frequencies for first 10,000 rows of ekg variable in nhamcsed2006 dataset :

    ekg/ecg |
(electrocar |
   diogram) |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      8,394       83.94       83.94
        yes |      1,606       16.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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