Frequencies for first 10,000 rows of cardmon variable in nhamcsed1999 dataset :

    cardiac |
    monitor |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,256       92.56       92.56
          1 |        744        7.44      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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