Frequencies for first 10,000 rows of chf variable in nhamcsopd2009 dataset :

       does |
patient now |
      have: |
 congestive |
      heart |
    failure |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,823       98.23       98.23
        yes |        177        1.77      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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