Frequencies for first 10,000 rows of ekg variable in nhamcsed1994 dataset :

        ekg |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,741       87.41       87.41
          1 |      1,259       12.59      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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