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

       does |
patient now |
      have: |
   ischemic |
      heart |
    disease |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,776       97.76       97.76
        yes |        224        2.24      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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