Frequencies for first 10,000 rows of cig_rec6 variable in natl2004 dataset :

 Cigarettes |
   Recode U |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,316       83.16       83.16
          1 |        737        7.37       90.53
          2 |        562        5.62       96.15
          3 |        162        1.62       97.77
          4 |         10        0.10       97.87
          6 |        213        2.13      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 21 Jan 2016