Frequencies for first 10,000 rows of ekg variable in nhamcsed2004 dataset :

        ekg |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      8,222       82.22       82.22
        yes |      1,778       17.78      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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