Frequencies for first 10,000 rows of cardmon variable in nhamcsed2008 dataset :

    cardiac |
    monitor |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,034       90.34       90.34
        yes |        966        9.66      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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