Frequencies for first 10,000 rows of chf variable in nhamcsed2015 dataset :

       Does |
    patient |
      have: |
 Congestive |
      heart |
    failure |
      (CHF) |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,661       96.61       96.61
        Yes |        339        3.39      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Nov 2017