Frequencies for first 10,000 rows of thrombo variable in nhamcsed2005 dataset :

thrombolyti |
  c therapy |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,983       99.83       99.83
        yes |         17        0.17      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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