Frequencies for first 10,000 rows of ekg variable in nhamcsopd2006 dataset :

    ekg/ecg |
(electrocar |
   diogram) |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,752       97.52       97.52
        Yes |        248        2.48      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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