Frequencies for first 10,000 rows of ihd variable in nhamcsopd2007 dataset :

       does |
patient now |
      have: |
   ischemic |
      heart |
    disease |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,790       97.90       97.90
        yes |        210        2.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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