Frequencies for first 10,000 rows of ihd variable in nhamcsopd2006 dataset :

       does |
patient now |
     have - |
   ischemic |
      heart |
    disease |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,728       97.28       97.28
        Yes |        272        2.72      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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