Frequencies for first 10,000 rows of usetobac variable in namcs2004 dataset :

       does |
patient use |
   tobacco? |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        317        3.17        3.17
          1 |        961        9.61       12.78
          2 |      5,864       58.64       71.42
          3 |      2,858       28.58      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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