Frequencies for first 10,000 rows of cig_rec variable in linkpe2009psden dataset :

 Cigarettes |
   Recode R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      3,422       34.22       34.22
          N |      6,576       65.76       99.98
          U |          1        0.01       99.99
          Y |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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