Frequencies for first 10,000 rows of tobaced variable in nhamcsopd2005 dataset :

    tobacco |
use/exposur |
          e |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,563       95.63       95.63
        yes |        437        4.37      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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