Frequencies for first 10,000 rows of cardmon variable in nhamcsed2000 dataset :

    cardiac |
    monitor |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,325       93.25       93.25
          1 |        675        6.75      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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