Frequencies for first 10,000 rows of tobaced variable in nhamcsopd2011 dataset :

    Tobacco |
use/Exposur |
          e |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,520       95.20       95.20
        Yes |        480        4.80      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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