Frequencies for first 10,000 rows of cardmon variable in nhamcsed2005 dataset :

    cardiac |
    monitor |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,094       90.94       90.94
        yes |        906        9.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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