Frequencies for first 10,000 rows of chf variable in nhamcsed2013 dataset :

       Does |
    patient |
      have: |
 Congestive |
      heart |
    failure |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,744       97.44       97.44
        Yes |        256        2.56      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016