Frequencies for first 10,000 rows of ekg variable in nhamcsed2001 dataset :

        ekg |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,556       85.56       85.56
          1 |      1,444       14.44      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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