Frequencies for first 10,000 rows of cardmon variable in nhamcsed2013 dataset :

    Cardiac |
    monitor |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,404       94.04       94.04
        Yes |        596        5.96      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016