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

Tobacco use |
          U |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      6,584       65.84       65.84
          1 |      3,415       34.15       99.99
          2 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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