Frequencies for first 10,000 rows of tobaced variable in nhamcsopd2006 dataset :

    tobacco |
use/exposur |
          e |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,624       96.24       96.24
        Yes |        376        3.76      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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