Frequencies for first 10,000 rows of cardiac variable in namcs2013 dataset :

    Cardiac |
stress test |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,969       99.69       99.69
        Yes |         31        0.31      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017