Frequencies for first 10,000 rows of cig_rec6 variable in natl2007 dataset :

 Cigarettes |
   Recode U |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,402       84.02       84.02
          1 |        781        7.81       91.83
          2 |        499        4.99       96.82
          3 |        132        1.32       98.14
          4 |          5        0.05       98.19
          6 |        181        1.81      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015