Frequencies for first 10,000 rows of ekg variable in nhamcsed1997 dataset :

        ekg |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,497       84.97       84.97
          1 |      1,503       15.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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