Frequencies for first 10,000 rows of cardmon variable in nhamcsed2015 dataset :

    Cardiac |
    monitor |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,159       91.59       91.59
        Yes |        841        8.41      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Nov 2017