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

Tobacco use |
          U |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         10        0.10        0.10
          1 |      9,990       99.90      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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