Frequencies for first 10,000 rows of chf variable in nhamcsed2009 dataset :

       does |
    patient |
      have: |
 congestive |
      heart |
    failure |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,667       96.67       96.67
          1 |        333        3.33      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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