Frequencies for first 10,000 rows of cardmon variable in nhamcsed2011 dataset :

    Cardiac |
    monitor |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,018       90.18       90.18
        Yes |        982        9.82      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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