Frequencies for first 10,000 rows of cig_rec6 variable in natl2008 dataset :

 Cigarettes |
   Recode U |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,753       87.53       87.53
          1 |        490        4.90       92.43
          2 |        517        5.17       97.60
          3 |        217        2.17       99.77
          4 |         17        0.17       99.94
          6 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 May 2016