Frequencies for first 10,000 rows of ekg variable in nhamcsed1998 dataset :

        ekg |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,572       85.72       85.72
          1 |      1,428       14.28      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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